patch 8.2.3394: filler lines are wrong when changing text in diff mode
Problem: Filler lines are wrong when changing text in diff mode.
Solution: Don't change the filler lines on every change. Check
scrollbinding when updating the filler lines. (closes #8809)
diff --git a/src/testdir/dumps/Test_diff_scroll_change_01.dump b/src/testdir/dumps/Test_diff_scroll_change_01.dump
new file mode 100644
index 0000000..886fe60
--- /dev/null
+++ b/src/testdir/dumps/Test_diff_scroll_change_01.dump
@@ -0,0 +1,20 @@
+| +0#0000e05#a8a8a8255@1|-+0#4040ff13#afffff255@34||+1#0000000#ffffff0| +0#0000e05#a8a8a8255@1|6+0#0000000#5fd7ff255| @33
+| +0#0000e05#a8a8a8255@1|-+0#4040ff13#afffff255@34||+1#0000000#ffffff0| +0#0000e05#a8a8a8255@1|7+0#0000000#5fd7ff255| @33
+| +0#0000e05#a8a8a8255@1|-+0#4040ff13#afffff255@34||+1#0000000#ffffff0| +0#0000e05#a8a8a8255@1|8+0#0000000#5fd7ff255| @33
+| +0#0000e05#a8a8a8255@1|9+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|9+0#0000000#ffffff0| @33
+| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|0| @32||+1&&| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|0| @32
+| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0@1| @32||+1&&| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0@1| @32
+| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|2| @32||+1&&| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|2| @32
+| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|3| @32||+1&&| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|3| @32
+| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|4| @32||+1&&| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|4| @32
+|-+0#0000e05#a8a8a8255| |1+0#0000000#ffffff0>5| @32||+1&&|-+0#0000e05#a8a8a8255| |1+0#0000000#ffffff0|5| @32
+|~+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
+|[+3#0000000&|N|o| |N|a|m|e|]| |[|+|]| @5|7|,|2| @11|A|l@1| |[+1&&|N|o| |N|a|m|e|]| |[|+|]| @5|1|5|,|2| @10|B|o|t
+| +0&&@74
diff --git a/src/testdir/dumps/Test_diff_scroll_change_02.dump b/src/testdir/dumps/Test_diff_scroll_change_02.dump
new file mode 100644
index 0000000..d699ded
--- /dev/null
+++ b/src/testdir/dumps/Test_diff_scroll_change_02.dump
@@ -0,0 +1,20 @@
+| +0#0000e05#a8a8a8255@1|-+0#4040ff13#afffff255@34||+1#0000000#ffffff0| +0#0000e05#a8a8a8255@1|6+0#0000000#5fd7ff255| @33
+| +0#0000e05#a8a8a8255@1|-+0#4040ff13#afffff255@34||+1#0000000#ffffff0| +0#0000e05#a8a8a8255@1|7+0#0000000#5fd7ff255| @33
+| +0#0000e05#a8a8a8255@1|-+0#4040ff13#afffff255@34||+1#0000000#ffffff0| +0#0000e05#a8a8a8255@1|8+0#0000000#5fd7ff255| @33
+| +0#0000e05#a8a8a8255@1|9+0#0000000#ffffff0| @33||+1&&| +0#0000e05#a8a8a8255@1|9+0#0000000#ffffff0| @33
+| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|0| @32||+1&&| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|0| @32
+| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0@1| @32||+1&&| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0@1| @32
+| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|2| @32||+1&&| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|2| @32
+| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|3| @32||+1&&| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|3| @32
+| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|4| @32||+1&&| +0#0000e05#a8a8a8255@1|1+0#0000000#ffffff0|4| @32
+| +0#0000e05#a8a8a8255@1|1+0#0000000#ffd7ff255|5>x+2&#ff404010| +0&#ffd7ff255@31||+1&#ffffff0| +0#0000e05#a8a8a8255@1|1+0#0000000#ffd7ff255|5| @32
+|~+0#4040ff13#ffffff0| @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
+|[+3#0000000&|N|o| |N|a|m|e|]| |[|+|]| @5|7|,|3| @11|A|l@1| |[+1&&|N|o| |N|a|m|e|]| |[|+|]| @5|1|5|,|3| @10|B|o|t
+| +0&&@74
diff --git a/src/testdir/test_diffmode.vim b/src/testdir/test_diffmode.vim
index 5400de6..268c3e9 100644
--- a/src/testdir/test_diffmode.vim
+++ b/src/testdir/test_diffmode.vim
@@ -993,6 +993,30 @@
call delete('XdiffSetup')
endfunc
+func Test_diff_with_scroll_and_change()
+ CheckScreendump
+
+ let lines =<< trim END
+ call setline(1, range(1, 15))
+ vnew
+ call setline(1, range(9, 15))
+ windo diffthis
+ wincmd h
+ exe "normal Gl5\<C-E>"
+ END
+ call writefile(lines, 'Xtest_scroll_change')
+ let buf = RunVimInTerminal('-S Xtest_scroll_change', {})
+
+ call VerifyScreenDump(buf, 'Test_diff_scroll_change_01', {})
+
+ call term_sendkeys(buf, "ax\<Esc>")
+ call VerifyScreenDump(buf, 'Test_diff_scroll_change_02', {})
+
+ " clean up
+ call StopVimInTerminal(buf)
+ call delete('Xtest_scroll_change')
+endfunc
+
func Test_diff_with_cursorline()
CheckScreendump