bug#74642: 31.0.50; [Patch] Turn off current source line indicator when gdb buffer is killed

[Diancheng Wang <diancheng_wang@163.com>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Diancheng Wang <diancheng_wang@163.com>
>> Cc: 74642@debbugs.gnu.org
>> Date: Thu, 05 Dec 2024 15:34:44 +0800
>> 
>> > Crystal ball says that the regression was caused by the change you
>> > submitted (and I installed) in bug#73687.  It added a call to
>> > gud-hide-current-line-indicator to gdb-starting and to gud-sentinel.
>> > Could you try reverting those changes and see if that solves the
>> > problem in Emacs 31?
>> 
>> Yes, There is a regression in my patch: the arrow on the source line is
>> not stopped displaying when "*gud-myprogram" got killed. But Emacs 30
>> and Emacs 31 still have another issue:
>> gud-highlight-current-line-overlay is not destroyed when
>> "*gud-myprogram*" got killed.
>
> As I already wrote, I don't see the problem in Emacs 30: when I kill
> the *gud-myprogram* buffer, the arrow disappears.
>
>> To reproduce it, you need to evaluate (setq
>> gud-highlight-current-line t).
>
> So in Emacs 30 this only happens when gud-highlight-current-line is
> non-nil?

Yes, the highlighted current source line in source file is not
un-highlighted when gud-highlight-current-line is non-nil.

>
>> I updated my patch to fix this 2 issues, see attachment.
>
> Does this fix the problem with the current-line indicator (either on
> the fringe or as overlay-arrow) in both Emacs 30 and Emacs 31?
>
> Thanks.

This patch depends on my previous patch, which is commit in master branch:

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commit bd5d84e5d3311e7ab4a7d0091d6c98365927d17a
Author: Diancheng Wang <diancheng_wang@163.com>
Date:   Tue Oct 8 11:11:24 2024 +0800

    Stop highlighting current line when debuggee is running

--8<---------------cut here---------------end--------------->8---

To apply this fix, Emacs 30 needs this commit.