patch 8.1.1072: extending sign and foldcolumn below the text is confusing

Problem:    Extending sign and foldcolumn below the text is confusing.
Solution:   Let the sign and foldcolumn stop at the last text line, just like
            the line number column.  Also stop the command line window leader.
            (Christian Brabandt, closes #3964)
diff --git a/src/testdir/dumps/Test_diff_11.dump b/src/testdir/dumps/Test_diff_11.dump
index 3b24ebb..b424b88 100644
--- a/src/testdir/dumps/Test_diff_11.dump
+++ b/src/testdir/dumps/Test_diff_11.dump
@@ -8,13 +8,13 @@
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 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@5|v|.|f|i|n|a|l|i|z|e| @18||+1&&| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@5|v|.|f|i|n|a|l|i|z|e| @18
 | +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@3|e|n|d| @27||+1&&| +0#0000e05#a8a8a8255@1| +0#0000000#ffffff0@3|e|n|d| @27
-| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
-| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
-| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
-| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
-| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
-| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
-| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
-| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33||+1#0000000&| +0#0000e05#a8a8a8255@1|~+0#4040ff13#ffffff0| @33
+|~+0#4040ff13&| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
 |X+3#0000000&|f|i|l|e|1| @12|1|,|0|-|1| @9|A|l@1| |X+1&&|f|i|l|e|2| @12|1|,|0|-|1| @9|A|l@1
 |:+0&&| @73