From e852bad3a7f9ae8a85117785f3ad18954b1a74fa Mon Sep 17 00:00:00 2001
From: Aufar Gilbran <aufargilbran@gmail.com>
Date: Fri, 2 Oct 2020 03:20:58 +0800
Subject: vim-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 vim/vim#6597)
https://github.com/vim/vim/commit/f8992d47cd50494c64bb733329067c9de3c75200
---
 src/nvim/testdir/test_display.vim | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'src/nvim/testdir')

diff --git a/src/nvim/testdir/test_display.vim b/src/nvim/testdir/test_display.vim
index 429253a863..98f6b17ccd 100644
--- a/src/nvim/testdir/test_display.vim
+++ b/src/nvim/testdir/test_display.vim
@@ -184,3 +184,27 @@ func Test_scroll_CursorLineNr_update()
   call StopVimInTerminal(buf)
   call delete(filename)
 endfunc
+
+" Test for scrolling that modifies buffer during visual block
+func Test_visual_block_scroll()
+  " See test/functional/legacy/visual_mode_spec.lua
+  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
-- 
cgit