bug#56561: 29.0.50; Infloop in try_window

[Michael Welsh Duggan <mwd@md5i.com>]

Eli Zaretskii <eliz@gnu.org> writes:

>> Cc: 56561@debbugs.gnu.org
>> Date: Fri, 15 Jul 2022 09:14:10 +0300
>> From: Eli Zaretskii <eliz@gnu.org>
>> 
>> Hmm... so the short tooltip text somehow causes us to exceed the
>> number of glyph rows of the matrix?  Please tell what the commands
>> below show:
>> 
>>  (gdb) pgrowx it->w->desired_matrix->rows
>>  (gdb) pgrowx it->w->desired_matrix->rows+1
>>  (gdb) pgrowx it->w->desired_matrix->rows+2
>>  (gdb) pgrowx it->w->desired_matrix->rows+3
>>  ...
>>  (gdb) pgrowx it->w->desired_matrix->rows+34
>> 
>> That is, I want to see the entire contents of the glyph rows.
>> 
>> Also
>> 
>>  (gdb) p it->last_visible_x
>>  (gdb) p it->last_visible_y
>
> Actually, I think I see the reason.  I installed a fix, but I cannot
> find a way of triggering the problem, so I cannot be 110% sure this is
> fixed.  I guess time will tell.

Sounds good.  I, unfortunately, lost my debug session due to an
unrelated window manager problem.  I'll certainly let you know if I ever
run into this again.

-- 
Michael Welsh Duggan
(md5i@md5i.com)