diff --git a/runtime/syntax/testdir/dumps/dots_01_00.dump b/runtime/syntax/testdir/dumps/dots_01_00.dump
new file mode 100644
index 0000000..c3fe7ba
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_01_00.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_01_01.dump b/runtime/syntax/testdir/dumps/dots_01_01.dump
new file mode 100644
index 0000000..dad9942
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_01_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_01_02.dump b/runtime/syntax/testdir/dumps/dots_01_02.dump
new file mode 100644
index 0000000..1710831
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_01_02.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_01_03.dump b/runtime/syntax/testdir/dumps/dots_01_03.dump
new file mode 100644
index 0000000..e011d4e
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_01_03.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_01_99.dump b/runtime/syntax/testdir/dumps/dots_01_99.dump
new file mode 100644
index 0000000..98cb073
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_01_99.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_02_00.dump b/runtime/syntax/testdir/dumps/dots_02_00.dump
new file mode 100644
index 0000000..1e9c10f
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_02_00.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_02_01.dump b/runtime/syntax/testdir/dumps/dots_02_01.dump
new file mode 100644
index 0000000..336d6be
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_02_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_02_02.dump b/runtime/syntax/testdir/dumps/dots_02_02.dump
new file mode 100644
index 0000000..b43d613
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_02_02.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_02_03.dump b/runtime/syntax/testdir/dumps/dots_02_03.dump
new file mode 100644
index 0000000..3d1d04e
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_02_03.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_02_99.dump b/runtime/syntax/testdir/dumps/dots_02_99.dump
new file mode 100644
index 0000000..3c96e63
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_02_99.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_03_00.dump b/runtime/syntax/testdir/dumps/dots_03_00.dump
new file mode 100644
index 0000000..35e038f
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_03_00.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_03_01.dump b/runtime/syntax/testdir/dumps/dots_03_01.dump
new file mode 100644
index 0000000..d1b4945
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_03_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_03_02.dump b/runtime/syntax/testdir/dumps/dots_03_02.dump
new file mode 100644
index 0000000..56b0065
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_03_02.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_03_03.dump b/runtime/syntax/testdir/dumps/dots_03_03.dump
new file mode 100644
index 0000000..a4a873a
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_03_03.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_03_99.dump b/runtime/syntax/testdir/dumps/dots_03_99.dump
new file mode 100644
index 0000000..74c4ec5
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_03_99.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_04_00.dump b/runtime/syntax/testdir/dumps/dots_04_00.dump
new file mode 100644
index 0000000..3848d3f
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_04_00.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_04_01.dump b/runtime/syntax/testdir/dumps/dots_04_01.dump
new file mode 100644
index 0000000..b86ce50
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_04_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_04_02.dump b/runtime/syntax/testdir/dumps/dots_04_02.dump
new file mode 100644
index 0000000..aa50446
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_04_02.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_04_03.dump b/runtime/syntax/testdir/dumps/dots_04_03.dump
new file mode 100644
index 0000000..f90875c
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_04_03.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_04_04.dump b/runtime/syntax/testdir/dumps/dots_04_04.dump
new file mode 100644
index 0000000..397d261
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_04_04.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_04_99.dump b/runtime/syntax/testdir/dumps/dots_04_99.dump
new file mode 100644
index 0000000..10c7b47
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_04_99.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_05_00.dump b/runtime/syntax/testdir/dumps/dots_05_00.dump
new file mode 100644
index 0000000..0f36067
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_05_00.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_05_01.dump b/runtime/syntax/testdir/dumps/dots_05_01.dump
new file mode 100644
index 0000000..65aea94
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_05_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_05_02.dump b/runtime/syntax/testdir/dumps/dots_05_02.dump
new file mode 100644
index 0000000..fff0e65
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_05_02.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_05_03.dump b/runtime/syntax/testdir/dumps/dots_05_03.dump
new file mode 100644
index 0000000..2e7337c
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_05_03.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_05_04.dump b/runtime/syntax/testdir/dumps/dots_05_04.dump
new file mode 100644
index 0000000..cfa410c
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_05_04.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_05_99.dump b/runtime/syntax/testdir/dumps/dots_05_99.dump
new file mode 100644
index 0000000..954ed49
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_05_99.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_06_00.dump b/runtime/syntax/testdir/dumps/dots_06_00.dump
new file mode 100644
index 0000000..0f57329
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_06_00.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_06_01.dump b/runtime/syntax/testdir/dumps/dots_06_01.dump
new file mode 100644
index 0000000..ad5c871
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_06_01.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_06_02.dump b/runtime/syntax/testdir/dumps/dots_06_02.dump
new file mode 100644
index 0000000..41845be
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_06_02.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_06_03.dump b/runtime/syntax/testdir/dumps/dots_06_03.dump
new file mode 100644
index 0000000..eb9f846
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_06_03.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_06_99.dump b/runtime/syntax/testdir/dumps/dots_06_99.dump
new file mode 100644
index 0000000..24baf5a
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_06_99.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_07_00.dump b/runtime/syntax/testdir/dumps/dots_07_00.dump
new file mode 100644
index 0000000..d0623f4
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_07_00.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_07_01.dump b/runtime/syntax/testdir/dumps/dots_07_01.dump
new file mode 100644
index 0000000..98cd186
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_07_01.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_07_02.dump b/runtime/syntax/testdir/dumps/dots_07_02.dump
new file mode 100644
index 0000000..719d589
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_07_02.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_07_03.dump b/runtime/syntax/testdir/dumps/dots_07_03.dump
new file mode 100644
index 0000000..d0cdd0d
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_07_03.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_07_04.dump b/runtime/syntax/testdir/dumps/dots_07_04.dump
new file mode 100644
index 0000000..eae929e
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_07_04.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_07_99.dump b/runtime/syntax/testdir/dumps/dots_07_99.dump
new file mode 100644
index 0000000..eae929e
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_07_99.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_08_00.dump b/runtime/syntax/testdir/dumps/dots_08_00.dump
new file mode 100644
index 0000000..eb079df
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_08_00.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_08_01.dump b/runtime/syntax/testdir/dumps/dots_08_01.dump
new file mode 100644
index 0000000..d17eb98
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_08_01.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_08_02.dump b/runtime/syntax/testdir/dumps/dots_08_02.dump
new file mode 100644
index 0000000..fc959de
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_08_02.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_08_03.dump b/runtime/syntax/testdir/dumps/dots_08_03.dump
new file mode 100644
index 0000000..348a883
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_08_03.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_08_04.dump b/runtime/syntax/testdir/dumps/dots_08_04.dump
new file mode 100644
index 0000000..864c59c
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_08_04.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_08_99.dump b/runtime/syntax/testdir/dumps/dots_08_99.dump
new file mode 100644
index 0000000..375e29d
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_08_99.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_09_00.dump b/runtime/syntax/testdir/dumps/dots_09_00.dump
new file mode 100644
index 0000000..10b63c9
--- /dev/null
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diff --git a/runtime/syntax/testdir/dumps/dots_09_01.dump b/runtime/syntax/testdir/dumps/dots_09_01.dump
new file mode 100644
index 0000000..a3792a2
--- /dev/null
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diff --git a/runtime/syntax/testdir/dumps/dots_09_02.dump b/runtime/syntax/testdir/dumps/dots_09_02.dump
new file mode 100644
index 0000000..3a0f1c8
--- /dev/null
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diff --git a/runtime/syntax/testdir/dumps/dots_09_03.dump b/runtime/syntax/testdir/dumps/dots_09_03.dump
new file mode 100644
index 0000000..00202be
--- /dev/null
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diff --git a/runtime/syntax/testdir/dumps/dots_17_03.dump b/runtime/syntax/testdir/dumps/dots_17_03.dump
new file mode 100644
index 0000000..3802678
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_17_03.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_17_99.dump b/runtime/syntax/testdir/dumps/dots_17_99.dump
new file mode 100644
index 0000000..3802678
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_17_99.dump
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diff --git a/runtime/syntax/testdir/dumps/dots_18_00.dump b/runtime/syntax/testdir/dumps/dots_18_00.dump
new file mode 100644
index 0000000..7c9fb22
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_18_00.dump
@@ -0,0 +1,20 @@
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+| +0#0000000&@56|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/dots_18_01.dump b/runtime/syntax/testdir/dumps/dots_18_01.dump
new file mode 100644
index 0000000..b134abd
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_18_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_18_02.dump b/runtime/syntax/testdir/dumps/dots_18_02.dump
new file mode 100644
index 0000000..10fea3b
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_18_02.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_18_03.dump b/runtime/syntax/testdir/dumps/dots_18_03.dump
new file mode 100644
index 0000000..ea90ef4
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_18_03.dump
@@ -0,0 +1,20 @@
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+| +0#0000000&@56|4|,|1| @10|B|o|t| 
diff --git a/runtime/syntax/testdir/dumps/dots_18_99.dump b/runtime/syntax/testdir/dumps/dots_18_99.dump
new file mode 100644
index 0000000..ea90ef4
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_18_99.dump
@@ -0,0 +1,20 @@
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+| +0#0000000&@56|4|,|1| @10|B|o|t| 
diff --git a/runtime/syntax/testdir/dumps/dots_19_00.dump b/runtime/syntax/testdir/dumps/dots_19_00.dump
new file mode 100644
index 0000000..599db81
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_19_00.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_19_01.dump b/runtime/syntax/testdir/dumps/dots_19_01.dump
new file mode 100644
index 0000000..59034b9
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_19_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_19_02.dump b/runtime/syntax/testdir/dumps/dots_19_02.dump
new file mode 100644
index 0000000..d38c4a9
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_19_02.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_19_03.dump b/runtime/syntax/testdir/dumps/dots_19_03.dump
new file mode 100644
index 0000000..be794bb
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_19_03.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_19_99.dump b/runtime/syntax/testdir/dumps/dots_19_99.dump
new file mode 100644
index 0000000..be794bb
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_19_99.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_20_00.dump b/runtime/syntax/testdir/dumps/dots_20_00.dump
new file mode 100644
index 0000000..5103c34
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_20_00.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_20_01.dump b/runtime/syntax/testdir/dumps/dots_20_01.dump
new file mode 100644
index 0000000..09c1fcc
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_20_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/dots_20_99.dump b/runtime/syntax/testdir/dumps/dots_20_99.dump
new file mode 100644
index 0000000..09c1fcc
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/dots_20_99.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/input/selftestdir/README.txt b/runtime/syntax/testdir/input/selftestdir/README.txt
new file mode 100644
index 0000000..035701d
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/README.txt
@@ -0,0 +1,10 @@
+The test files with made-up syntax in this directory serve for additional
+linewise checks to be manually performed whenever the algorithm managing
+screen dump file generation is modified (../../runtest.vim#RunTest()).
+
+This is mainly used for debugging and testing the syntax test suite.
+
+Please test any changes as follows:
+	cd runtime/syntax/
+	VIM_SYNTAX_SELF_TESTING=1 make clean test
+
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_01 b/runtime/syntax/testdir/input/selftestdir/dots_01
new file mode 100644
index 0000000..cf78d97
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_01
@@ -0,0 +1,60 @@
+..........................................................................1
+..........................................................................2
+..........................................................................3
+..........................................................................4
+..............................winwidth(0): 75.............................5
+.............................winheight(0): 19.............................6
+.................................ruler....................................7
+..........................................................................8
+..........................................................................9
+.........................................................................10
+.........................................................................11
+.........................................................................12
+.........................................................................13
+.........................................................................14
+.........................................................................15
+.........................................................................16
+.........................................................................17
+.........................................................................18
+.........................................................................19
+.........................................................................20
+.........................................................................21
+.........................................................................22
+.........................................................................23
+.........................................................................24
+.........................................................................25
+.........................................................................26
+.........................................................................27
+.........................................................................28
+.........................................................................29
+.........................................................................30
+.........................................................................31
+.........................................................................32
+.........................................................................33
+.........................................................................34
+.........................................................................35
+.........................................................................36
+.........................................................................37
+.........................................................................38
+.........................................................................39
+.........................................................................40
+.........................................................................41
+.........................................................................42
+.........................................................................43
+.........................................................................44
+.........................................................................45
+.........................................................................46
+.........................................................................47
+.........................................................................48
+.........................................................................49
+.........................................................................50
+.........................................................................51
+.........................................................................52
+.........................................................................53
+.........................................................................54
+.........................................................................55
+.........................................................................56
+.........................................................................57
+.........................................................................58
+.........................................................................59
+.........................................................................60
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_02 b/runtime/syntax/testdir/input/selftestdir/dots_02
new file mode 100644
index 0000000..4748fa1
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_02
@@ -0,0 +1,30 @@
+1..........................................................................2
+3..........................................................................4
+5..........................................................................6
+7..........................................................................8
+9............................winwidth(0): 75...............................10
+11..........................winheight(0): 19...............................12
+13..............................ruler......................................14
+15.........................................................................16
+17.........................................................................18
+19.........................................................................20
+21.........................................................................22
+23.........................................................................24
+25.........................................................................26
+27.........................................................................28
+29.........................................................................30
+31.........................................................................32
+33.........................................................................34
+35.........................................................................36
+37.........................................................................38
+39.........................................................................40
+41.........................................................................42
+43.........................................................................44
+45.........................................................................46
+47.........................................................................48
+49.........................................................................50
+51.........................................................................52
+53.........................................................................54
+55.........................................................................56
+57.........................................................................58
+59.........................................................................60
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_03 b/runtime/syntax/testdir/input/selftestdir/dots_03
new file mode 100644
index 0000000..a8a16e9
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_03
@@ -0,0 +1,20 @@
+1..........................................................................2..........................................................................3
+4..........................................................................5..........................................................................6
+7..........................................................................8..........................................................................9
+10.........................................................................11.........................................................................12
+13...........................winwidth(0): 75...............................14.........................................................................15
+16..........................winheight(0): 19...............................17.........................................................................18
+19..............................ruler......................................20.........................................................................21
+22.........................................................................23.........................................................................24
+25.........................................................................26.........................................................................27
+28.........................................................................29.........................................................................30
+31.........................................................................32.........................................................................33
+34.........................................................................35.........................................................................36
+37.........................................................................38.........................................................................39
+40.........................................................................41.........................................................................42
+43.........................................................................44.........................................................................45
+46.........................................................................47.........................................................................48
+49.........................................................................50.........................................................................51
+52.........................................................................53.........................................................................54
+55.........................................................................56.........................................................................57
+58.........................................................................59.........................................................................60
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_04 b/runtime/syntax/testdir/input/selftestdir/dots_04
new file mode 100644
index 0000000..ac0a26a
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_04
@@ -0,0 +1,15 @@
+1..........................................................................2..........................................................................3..........................................................................4
+5..........................................................................6..........................................................................7..........................................................................8
+9..........................................................................10.........................................................................11.........................................................................12
+13.........................................................................14.........................................................................15.........................................................................16
+17...........................winwidth(0): 75...............................18.........................................................................19.........................................................................20
+21..........................winheight(0): 19...............................22.........................................................................23.........................................................................24
+25..............................ruler......................................26.........................................................................27.........................................................................28
+29.........................................................................30.........................................................................31.........................................................................32
+33.........................................................................34.........................................................................35.........................................................................36
+37.........................................................................38.........................................................................39.........................................................................40
+41.........................................................................42.........................................................................43.........................................................................44
+45.........................................................................46.........................................................................47.........................................................................48
+49.........................................................................50.........................................................................51.........................................................................52
+53.........................................................................54.........................................................................55.........................................................................56
+57.........................................................................58.........................................................................59.........................................................................60
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_05 b/runtime/syntax/testdir/input/selftestdir/dots_05
new file mode 100644
index 0000000..2dfb5be
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_05
@@ -0,0 +1,12 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5
+6..........................................................................7..........................................................................8..........................................................................9..........................................................................10
+11.........................................................................12.........................................................................13.........................................................................14.........................................................................15
+16.........................................................................17.........................................................................18.........................................................................19.........................................................................20
+21...........................winwidth(0): 75...............................22.........................................................................23.........................................................................24.........................................................................25
+26..........................winheight(0): 19...............................27.........................................................................28.........................................................................29.........................................................................30
+31..............................ruler......................................32.........................................................................33.........................................................................34.........................................................................35
+36.........................................................................37.........................................................................38.........................................................................39.........................................................................40
+41.........................................................................42.........................................................................43.........................................................................44.........................................................................45
+46.........................................................................47.........................................................................48.........................................................................49.........................................................................50
+51.........................................................................52.........................................................................53.........................................................................54.........................................................................55
+56.........................................................................57.........................................................................58.........................................................................59.........................................................................60
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_06 b/runtime/syntax/testdir/input/selftestdir/dots_06
new file mode 100644
index 0000000..87eaf76
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_06
@@ -0,0 +1,10 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6
+7..........................................................................8..........................................................................9..........................................................................10.........................................................................11.........................................................................12
+13.........................................................................14.........................................................................15.........................................................................16.........................................................................17.........................................................................18
+19.........................................................................20.........................................................................21.........................................................................22.........................................................................23.........................................................................24
+25...........................winwidth(0): 75...............................26.........................................................................27.........................................................................28.........................................................................29.........................................................................30
+31..........................winheight(0): 19...............................32.........................................................................33.........................................................................34.........................................................................35.........................................................................36
+37..............................ruler......................................38.........................................................................39.........................................................................40.........................................................................41.........................................................................42
+43.........................................................................44.........................................................................45.........................................................................46.........................................................................47.........................................................................48
+49.........................................................................50.........................................................................51.........................................................................52.........................................................................53.........................................................................54
+55.........................................................................56.........................................................................57.........................................................................58.........................................................................59.........................................................................60
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_07 b/runtime/syntax/testdir/input/selftestdir/dots_07
new file mode 100644
index 0000000..801c470
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_07
@@ -0,0 +1,9 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6..........................................................................7
+8..........................................................................9..........................................................................10.........................................................................11.........................................................................12.........................................................................13.........................................................................14
+15.........................................................................16.........................................................................17.........................................................................18.........................................................................19.........................................................................20.........................................................................21
+22.........................................................................23.........................................................................24.........................................................................25.........................................................................26.........................................................................27.........................................................................28
+29...........................winwidth(0): 75...............................30.........................................................................31.........................................................................32.........................................................................33.........................................................................34.........................................................................35
+36..........................winheight(0): 19...............................37.........................................................................38.........................................................................39.........................................................................40.........................................................................41.........................................................................42
+43..............................ruler......................................44.........................................................................45.........................................................................46.........................................................................47.........................................................................48.........................................................................49
+50.........................................................................51.........................................................................52.........................................................................53.........................................................................54.........................................................................55.........................................................................56
+57.........................................................................58.........................................................................59.........................................................................60.........................................................................61.........................................................................62.........................................................................63
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_08 b/runtime/syntax/testdir/input/selftestdir/dots_08
new file mode 100644
index 0000000..2b7bdd9
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_08
@@ -0,0 +1,8 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6..........................................................................7..........................................................................8
+9..........................................................................10.........................................................................11.........................................................................12.........................................................................13.........................................................................14.........................................................................15.........................................................................16
+17.........................................................................18.........................................................................19.........................................................................20.........................................................................21.........................................................................22.........................................................................23.........................................................................24
+25.........................................................................26.........................................................................27.........................................................................28.........................................................................29.........................................................................30.........................................................................31.........................................................................32
+33...........................winwidth(0): 75...............................34.........................................................................35.........................................................................36.........................................................................37.........................................................................38.........................................................................39.........................................................................40
+41..........................winheight(0): 19...............................42.........................................................................43.........................................................................44.........................................................................45.........................................................................46.........................................................................47.........................................................................48
+49..............................ruler......................................50.........................................................................51.........................................................................52.........................................................................53.........................................................................54.........................................................................55.........................................................................56
+57.........................................................................58.........................................................................59.........................................................................60.........................................................................61.........................................................................62.........................................................................63.........................................................................64
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_09 b/runtime/syntax/testdir/input/selftestdir/dots_09
new file mode 100644
index 0000000..76b25e6
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_09
@@ -0,0 +1,7 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6..........................................................................7..........................................................................8..........................................................................9
+10.........................................................................11.........................................................................12.........................................................................13.........................................................................14.........................................................................15.........................................................................16.........................................................................17.........................................................................18
+19.........................................................................20.........................................................................21.........................................................................22.........................................................................23.........................................................................24.........................................................................25.........................................................................26.........................................................................27
+28.........................................................................29.........................................................................30.........................................................................31.........................................................................32.........................................................................33.........................................................................34.........................................................................35.........................................................................36
+37...........................winwidth(0): 75...............................38.........................................................................39.........................................................................40.........................................................................41.........................................................................42.........................................................................43.........................................................................44.........................................................................45
+46..........................winheight(0): 19...............................47.........................................................................48.........................................................................49.........................................................................50.........................................................................51.........................................................................52.........................................................................53.........................................................................54
+55..............................ruler......................................56.........................................................................57.........................................................................58.........................................................................59.........................................................................60.........................................................................61.........................................................................62.........................................................................63
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_10 b/runtime/syntax/testdir/input/selftestdir/dots_10
new file mode 100644
index 0000000..9d6a158
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_10
@@ -0,0 +1,6 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6..........................................................................7..........................................................................8..........................................................................9..........................................................................10
+11.........................................................................12.........................................................................13.........................................................................14.........................................................................15.........................................................................16.........................................................................17.........................................................................18.........................................................................19.........................................................................20
+21.........................................................................22.........................................................................23.........................................................................24.........................................................................25.........................................................................26.........................................................................27.........................................................................28.........................................................................29.........................................................................30
+31...........................winwidth(0): 75...............................32.........................................................................33.........................................................................34.........................................................................35.........................................................................36.........................................................................37.........................................................................38.........................................................................39.........................................................................40
+41..........................wihheight(0): 19...............................42.........................................................................43.........................................................................44.........................................................................45.........................................................................46.........................................................................47.........................................................................48.........................................................................49.........................................................................50
+51..............................ruler......................................52.........................................................................53.........................................................................54.........................................................................55.........................................................................56.........................................................................57.........................................................................58.........................................................................59.........................................................................60
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_11 b/runtime/syntax/testdir/input/selftestdir/dots_11
new file mode 100644
index 0000000..503b734
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_11
@@ -0,0 +1,6 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6..........................................................................7..........................................................................8..........................................................................9..........................................................................10.........................................................................11
+12.........................................................................13.........................................................................14.........................................................................15.........................................................................16.........................................................................17.........................................................................18.........................................................................19.........................................................................20.........................................................................21.........................................................................22
+23.........................................................................24.........................................................................25.........................................................................26.........................................................................27.........................................................................28.........................................................................29.........................................................................30.........................................................................31.........................................................................32.........................................................................33
+34...........................winwidth(0): 75...............................35.........................................................................36.........................................................................37.........................................................................38.........................................................................39.........................................................................40.........................................................................41.........................................................................42.........................................................................43.........................................................................44
+45..........................winheight(0): 19...............................46.........................................................................47.........................................................................48.........................................................................49.........................................................................50.........................................................................51.........................................................................52.........................................................................53.........................................................................54.........................................................................55
+56..............................ruler......................................57.........................................................................58.........................................................................59.........................................................................60.........................................................................61.........................................................................62.........................................................................63.........................................................................64.........................................................................65.........................................................................66
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_12 b/runtime/syntax/testdir/input/selftestdir/dots_12
new file mode 100644
index 0000000..347feb2
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_12
@@ -0,0 +1,5 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6..........................................................................7..........................................................................8..........................................................................9..........................................................................10.........................................................................11.........................................................................12
+13.........................................................................14.........................................................................15.........................................................................16.........................................................................17.........................................................................18.........................................................................19.........................................................................20.........................................................................21.........................................................................22.........................................................................23.........................................................................24
+25...........................winwidth(0): 75...............................26.........................................................................27.........................................................................28.........................................................................29.........................................................................30.........................................................................31.........................................................................32.........................................................................33.........................................................................34.........................................................................35.........................................................................36
+37..........................winheight(0): 19...............................38.........................................................................39.........................................................................40.........................................................................41.........................................................................42.........................................................................43.........................................................................44.........................................................................45.........................................................................46.........................................................................47.........................................................................48
+49..............................ruler......................................50.........................................................................51.........................................................................52.........................................................................53.........................................................................54.........................................................................55.........................................................................56.........................................................................57.........................................................................58.........................................................................59.........................................................................60
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_13 b/runtime/syntax/testdir/input/selftestdir/dots_13
new file mode 100644
index 0000000..b177614
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_13
@@ -0,0 +1,5 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6..........................................................................7..........................................................................8..........................................................................9..........................................................................10.........................................................................11.........................................................................12.........................................................................13
+14.........................................................................15.........................................................................16.........................................................................17.........................................................................18.........................................................................19.........................................................................20.........................................................................21.........................................................................22.........................................................................23.........................................................................24.........................................................................25.........................................................................26
+27...........................winwidth(0): 75...............................28.........................................................................29.........................................................................30.........................................................................31.........................................................................32.........................................................................33.........................................................................34.........................................................................35.........................................................................36.........................................................................37.........................................................................38.........................................................................39
+40..........................winheight(0): 19...............................41.........................................................................42.........................................................................43.........................................................................44.........................................................................45.........................................................................46.........................................................................47.........................................................................48.........................................................................49.........................................................................50.........................................................................51.........................................................................52
+53..............................ruler......................................54.........................................................................55.........................................................................56.........................................................................57.........................................................................58.........................................................................59.........................................................................60.........................................................................61.........................................................................62.........................................................................63.........................................................................64.........................................................................65
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_14 b/runtime/syntax/testdir/input/selftestdir/dots_14
new file mode 100644
index 0000000..9a46c3e
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_14
@@ -0,0 +1,5 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6..........................................................................7..........................................................................8..........................................................................9..........................................................................10.........................................................................11.........................................................................12.........................................................................13.........................................................................14
+15.........................................................................16.........................................................................17.........................................................................18.........................................................................19.........................................................................20.........................................................................21.........................................................................22.........................................................................23.........................................................................24.........................................................................25.........................................................................26.........................................................................27.........................................................................28
+29...........................winwidth(0): 75...............................30.........................................................................31.........................................................................32.........................................................................33.........................................................................34.........................................................................35.........................................................................36.........................................................................37.........................................................................38.........................................................................39.........................................................................40.........................................................................41.........................................................................42
+43..........................winheight(0): 19...............................44.........................................................................45.........................................................................46.........................................................................47.........................................................................48.........................................................................49.........................................................................50.........................................................................51.........................................................................52.........................................................................53.........................................................................54.........................................................................55.........................................................................56
+57..............................ruler......................................58.........................................................................59.........................................................................60.........................................................................61.........................................................................62.........................................................................63.........................................................................64.........................................................................65.........................................................................66.........................................................................67.........................................................................68.........................................................................69.........................................................................70
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_15 b/runtime/syntax/testdir/input/selftestdir/dots_15
new file mode 100644
index 0000000..45fbef9
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_15
@@ -0,0 +1,4 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6..........................................................................7..........................................................................8..........................................................................9..........................................................................10.........................................................................11.........................................................................12.........................................................................13.........................................................................14.........................................................................15
+16...........................winwidth(0): 75...............................17.........................................................................18.........................................................................19.........................................................................20.........................................................................21.........................................................................22.........................................................................23.........................................................................24.........................................................................25.........................................................................26.........................................................................27.........................................................................28.........................................................................29.........................................................................30
+31..........................winheight(0): 19...............................32.........................................................................33.........................................................................34.........................................................................35.........................................................................36.........................................................................37.........................................................................38.........................................................................39.........................................................................40.........................................................................41.........................................................................42.........................................................................43.........................................................................44.........................................................................45
+46..............................ruler......................................47.........................................................................48.........................................................................49.........................................................................50.........................................................................51.........................................................................52.........................................................................53.........................................................................54.........................................................................55.........................................................................56.........................................................................57.........................................................................58.........................................................................59.........................................................................60
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_16 b/runtime/syntax/testdir/input/selftestdir/dots_16
new file mode 100644
index 0000000..1af3caa
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_16
@@ -0,0 +1,4 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6..........................................................................7..........................................................................8..........................................................................9..........................................................................10.........................................................................11.........................................................................12.........................................................................13.........................................................................14.........................................................................15.........................................................................16
+17...........................winwidth(0): 75...............................18.........................................................................19.........................................................................20.........................................................................21.........................................................................22.........................................................................23.........................................................................24.........................................................................25.........................................................................26.........................................................................27.........................................................................28.........................................................................29.........................................................................30.........................................................................31.........................................................................32
+33..........................winheight(0): 19...............................34.........................................................................35.........................................................................36.........................................................................37.........................................................................38.........................................................................39.........................................................................40.........................................................................41.........................................................................42.........................................................................43.........................................................................44.........................................................................45.........................................................................46.........................................................................47.........................................................................48
+49..............................ruler......................................50.........................................................................51.........................................................................52.........................................................................53.........................................................................54.........................................................................55.........................................................................56.........................................................................57.........................................................................58.........................................................................59.........................................................................60.........................................................................61.........................................................................62.........................................................................63.........................................................................64
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_17 b/runtime/syntax/testdir/input/selftestdir/dots_17
new file mode 100644
index 0000000..6dc5050
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_17
@@ -0,0 +1,4 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6..........................................................................7..........................................................................8..........................................................................9..........................................................................10.........................................................................11.........................................................................12.........................................................................13.........................................................................14.........................................................................15.........................................................................16.........................................................................17
+18...........................winwidth(0): 75...............................19.........................................................................20.........................................................................21.........................................................................22.........................................................................23.........................................................................24.........................................................................25.........................................................................26.........................................................................27.........................................................................28.........................................................................29.........................................................................30.........................................................................31.........................................................................32.........................................................................33.........................................................................34
+35..........................winheight(0): 19...............................36.........................................................................37.........................................................................38.........................................................................39.........................................................................40.........................................................................41.........................................................................42.........................................................................43.........................................................................44.........................................................................45.........................................................................46.........................................................................47.........................................................................48.........................................................................49.........................................................................50.........................................................................51
+52...............................ruler.....................................53.........................................................................54.........................................................................55.........................................................................56.........................................................................57.........................................................................58.........................................................................59.........................................................................60.........................................................................61.........................................................................62.........................................................................63.........................................................................64.........................................................................65.........................................................................66.........................................................................67.........................................................................68
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_18 b/runtime/syntax/testdir/input/selftestdir/dots_18
new file mode 100644
index 0000000..f84a827
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_18
@@ -0,0 +1,4 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6..........................................................................7..........................................................................8..........................................................................9..........................................................................10.........................................................................11.........................................................................12.........................................................................13.........................................................................14.........................................................................15.........................................................................16.........................................................................17.........................................................................18
+19...........................winwidth(0): 75...............................20.........................................................................21.........................................................................22.........................................................................23.........................................................................24.........................................................................25.........................................................................26.........................................................................27.........................................................................28.........................................................................29.........................................................................30.........................................................................31.........................................................................32.........................................................................33.........................................................................34.........................................................................35.........................................................................36
+37..........................winheight(0): 19...............................38.........................................................................39.........................................................................40.........................................................................41.........................................................................42.........................................................................43.........................................................................44.........................................................................45.........................................................................46.........................................................................47.........................................................................48.........................................................................49.........................................................................50.........................................................................51.........................................................................52.........................................................................53.........................................................................54
+55...............................ruler.....................................56.........................................................................57.........................................................................58.........................................................................59.........................................................................60.........................................................................61.........................................................................62.........................................................................63.........................................................................64.........................................................................65.........................................................................66.........................................................................67.........................................................................68.........................................................................69.........................................................................70.........................................................................71.........................................................................72
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_19 b/runtime/syntax/testdir/input/selftestdir/dots_19
new file mode 100644
index 0000000..9f0ad00
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_19
@@ -0,0 +1,4 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5..........................................................................6..........................................................................7..........................................................................8..........................................................................9..........................................................................10.........................................................................11.........................................................................12.........................................................................13.........................................................................14.........................................................................15.........................................................................16.........................................................................17.........................................................................18.........................................................................19
+20...........................winwidth(0): 75...............................21.........................................................................22.........................................................................23.........................................................................24.........................................................................25.........................................................................26.........................................................................27.........................................................................28.........................................................................29.........................................................................30.........................................................................31.........................................................................32.........................................................................33.........................................................................34.........................................................................35.........................................................................36.........................................................................37.........................................................................38
+39..........................winheight(0): 19...............................40.........................................................................41.........................................................................42.........................................................................43.........................................................................44.........................................................................45.........................................................................46.........................................................................47.........................................................................48.........................................................................49.........................................................................50.........................................................................51.........................................................................52.........................................................................53.........................................................................54.........................................................................55.........................................................................56.........................................................................57
+58...............................ruler.....................................59.........................................................................60.........................................................................61.........................................................................62.........................................................................63.........................................................................64.........................................................................65.........................................................................66.........................................................................67.........................................................................68.........................................................................69.........................................................................70.........................................................................71.........................................................................72.........................................................................73.........................................................................74.........................................................................75.........................................................................76
diff --git a/runtime/syntax/testdir/input/selftestdir/dots_20 b/runtime/syntax/testdir/input/selftestdir/dots_20
new file mode 100644
index 0000000..ca3a93d
--- /dev/null
+++ b/runtime/syntax/testdir/input/selftestdir/dots_20
@@ -0,0 +1,2 @@
+1..........................................................................2..........................................................................3..........................................................................4..........................................................................5.............................winwidth(0): 75..............................6............................winheight(0): 19..............................7................................ruler.....................................8..........................................................................9..........................................................................10.........................................................................11.........................................................................12.........................................................................13.........................................................................14.........................................................................15.........................................................................16.........................................................................17.........................................................................18.........................................................................19.........................................................................20.........................................................................21.........................................................................22.........................................................................23.........................................................................24.........................................................................25.........................................................................26.........................................................................27.........................................................................28.........................................................................29.........................................................................30.........................................................................31.........................................................................32.........................................................................33.........................................................................34.........................................................................35.........................................................................36.........................................................................37.........................................................................38
+39.........................................................................40.........................................................................41.........................................................................42.........................................................................43.........................................................................44.........................................................................45.........................................................................46.........................................................................47.........................................................................48.........................................................................49.........................................................................50.........................................................................51.........................................................................52.........................................................................53.........................................................................54.........................................................................55.........................................................................56.........................................................................57.........................................................................58.........................................................................59.........................................................................60.........................................................................61.........................................................................62.........................................................................63.........................................................................64.........................................................................65.........................................................................66.........................................................................67.........................................................................68.........................................................................69.........................................................................70.........................................................................71.........................................................................72.........................................................................73.........................................................................74.........................................................................75.........................................................................76
diff --git a/runtime/syntax/testdir/runtest.vim b/runtime/syntax/testdir/runtest.vim
index f2f86c0..3f45ecc 100644
--- a/runtime/syntax/testdir/runtest.vim
+++ b/runtime/syntax/testdir/runtest.vim
@@ -116,13 +116,17 @@
   let setup = glob('input/setup/*.vim', 1, 1)
     \ ->reduce({d, f -> extend(d, {fnamemodify(f, ':t:r'): f})}, {})
 
-  for fname in glob('input/*.*', 1, 1)
-    if fname =~ '\~$'
-      " backup file, skip
-      continue
-    endif
+  if exists("$VIM_SYNTAX_SELF_TESTING")
+    let dirpath = 'input/selftestdir/'
+    let fnames = readdir(dirpath, {fname -> fname !~ '^README.txt$'})
+  else
+    let dirpath = 'input/'
+    let fnames = readdir(dirpath, {fname -> fname !~ '\~$' && fname =~ '^.\+\..\+$'})
+  endif
 
-    let root = fnamemodify(fname, ':t:r')
+  for fname in fnames
+    let root = fnamemodify(fname, ':r')
+    let fname = dirpath .. fname
     let filetype = substitute(root, '\([^_.]*\)[_.].*', '\1', '')
     let failed_root = 'failed/' .. root