From 8279af514ca7e5fd3c31cf13b0864163d1a0bfeb Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Mon, 26 Sep 2022 23:08:22 +0100
Subject: patch 9.0.0598: using negative array index with negative width window

Problem:    Using negative array index with negative width window.
Solution:   Make sure the window width does not become negative.
---
 src/testdir/test_cmdwin.vim | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'src/testdir/test_cmdwin.vim')

diff --git a/src/testdir/test_cmdwin.vim b/src/testdir/test_cmdwin.vim
index 6a420ed0aa..dc6889495f 100644
--- a/src/testdir/test_cmdwin.vim
+++ b/src/testdir/test_cmdwin.vim
@@ -404,5 +404,27 @@ func Test_cmdwin_freed_buffer_ptr()
   bwipe!
 endfunc
 
+" This was resulting in a window with negative width.
+" The test doesn't reproduce the illegal memory access though...
+func Test_cmdwin_split_often()
+  let lines = &lines
+  let columns = &columns
+  set t_WS=
+
+  try
+    set encoding=iso8859
+    set ruler
+    winsize 0 0
+    noremap 0 H
+    sil norm 0000000q:
+  catch /E36:/
+  endtry
+
+  bwipe!
+  set encoding=utf8
+  let &lines = lines
+  let &columns = columns
+endfunc
+
 
 " vim: shiftwidth=2 sts=2 expandtab
-- 
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