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patch 9.1.0047: issues with temp curwin/buf while cmdwin is open

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Problem:  Things that temporarily change/restore curwin/buf (e.g:
          win_execute, some autocmds) may break assumptions that
          curwin/buf is the cmdwin when "cmdwin_type != 0", causing
          issues.

Solution: Expose the cmdwin's real win/buf and check that instead. Also
          try to ensure these variables are NULL if "cmdwin_type == 0",
          allowing them to be used directly in most cases without
          checking cmdwin_type. (Sean Dewar)

Alternatively, we could ban win_execute in the cmdwin and audit all places that
temporarily change/restore curwin/buf, but I didn't notice any problems arising
from allowing this (standard cmdwin restrictions still apply, so things that may
actually break the cmdwin are still forbidden).

closes: #12819

Signed-off-by: Sean Dewar <seandewar@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Sean Dewar
2023-08-16 14:17:36 +01:00
committed by Christian Brabandt
parent 4927110a43
commit 988f74311c
13 changed files with 67 additions and 13 deletions
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2
src/drawscreen.c
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@@ -1087,7 +1087,7 @@ fold_line(
// 1. Add the cmdwin_type for the command-line window
// Ignores 'rightleft', this window is never right-left.
if (cmdwin_type != 0 && wp == curwin)
if (wp == cmdwin_win)
{
ScreenLines[off] = cmdwin_type;
ScreenAttrs[off] = HL_ATTR(HLF_AT);