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patch 9.1.0048: Abort opening cmdwin if autocmds screw things up

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Problem:  Autocmds triggered from opening the cmdwin (in win_split and
          do_ecmd) can cause issues such as E199, as the current checks
          are insufficient.

Solution: Commands executed from the cmdwin apply to the old curwin/buf,
          so they should be kept in a "suspended" state; abort if
          they've changed. Also abort if cmdwin/buf was tampered with,
          and check that curwin is correct. Try to clean up the cmdwin
          buffer (only if hidden and non-current to simplify things; the
          same approach is used when closing cmdwin normally), and add a
          beep. (Sean Dewar)

It'd be nice to also check that curwin was *really* created by win_split, as
autocommands can change curwin before it returns (so it can't be assumed to be
that of the split); for now, this means that the cmdwin may not be the botwin in
that case, which is probably OK.

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 16:17:31 +01:00
committed by Christian Brabandt
parent 988f74311c
commit 43b395ec2e
6 changed files with 110 additions and 13 deletions
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4
src/errors.h
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@@ -471,8 +471,8 @@ EXTERN char e_no_digraphs_version[]
EXTERN char e_cannot_set_language_to_str[]
INIT(= N_("E197: Cannot set language to \"%s\""));
// E198 unused
EXTERN char e_active_window_or_buffer_deleted[]
INIT(= N_("E199: Active window or buffer deleted"));
EXTERN char e_active_window_or_buffer_changed_or_deleted[]
INIT(= N_("E199: Active window or buffer changed or deleted"));
EXTERN char e_readpre_autocommands_made_file_unreadable[]
INIT(= N_("E200: *ReadPre autocommands made the file unreadable"));
EXTERN char e_readpre_autocommands_must_not_change_current_buffer[]