patch 8.2.1345: Redraw error when using visual block and scroll
Problem: Redraw error when using visual block and scroll.
Solution: Add check for w_topline. ( closes #6597)
diff --git a/src/testdir/dumps/Test_display_visual_block_scroll.dump b/src/testdir/dumps/Test_display_visual_block_scroll.dump
new file mode 100644
index 0000000..afb52fb
--- /dev/null
+++ b/src/testdir/dumps/Test_display_visual_block_scroll.dump
@@ -0,0 +1,7 @@
+|{+0&#e0e0e08| | +0&#ffffff0@72
+|}+0&#e0e0e08| | +0&#ffffff0@72
+|{+0&#e0e0e08| | +0&#ffffff0@72
+|f+0&#e0e0e08| | +0&#ffffff0@72
+>g| +0&#e0e0e08| +0&#ffffff0@72
+|}| @73
+|-+2&&@1| |V|I|S|U|A|L| |L|I|N|E| |-@1| +0&&@29|7| @8|1@1|,|1| @9|B|o|t|
diff --git a/src/testdir/test_display.vim b/src/testdir/test_display.vim
index ed111a5..1e2ed45 100644
--- a/src/testdir/test_display.vim
+++ b/src/testdir/test_display.vim
@@ -220,3 +220,26 @@
call delete('Xmac.txt')
call delete(filename)
endfunc
+
+" Test for scrolling that modifies buffer during visual block
+func Test_visual_block_scroll()
+ CheckScreendump
+
+ let lines =<< trim END
+ source $VIMRUNTIME/plugin/matchparen.vim
+ set scrolloff=1
+ call setline(1, ['a', 'b', 'c', 'd', 'e', '', '{', '}', '{', 'f', 'g', '}'])
+ call cursor(5, 1)
+ END
+
+ let filename = 'Xvisualblockmodifiedscroll'
+ call writefile(lines, filename)
+
+ let buf = RunVimInTerminal('-S '.filename, #{rows: 7})
+ call term_sendkeys(buf, "V\<C-D>\<C-D>")
+
+ call VerifyScreenDump(buf, 'Test_display_visual_block_scroll', {})
+
+ call StopVimInTerminal(buf)
+ call delete(filename)
+endfunc