bug#69478: 30.0.50; Emacs dies after scrolling in eww

[Po Lu]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Po Lu <luangruo@yahoo.com>
>> Cc: Alexander Prähauser <ahprae@protonmail.com>,
>>   69478@debbugs.gnu.org
>> Date: Fri, 01 Mar 2024 09:48:49 +0800
>> 
>> This is a BadMatch error triggered by copying between incompatible
>> drawables with a CopyArea request, which isn't possible in most of our
>> callers.  The crash's circumstances suggest that an image is being
>> created and subsequently copied with incompatible parameters, but to
>> establish which image that is Emacs must be started as follows:
>> 
>>   ./emacs -xrm 'Emacs.synchronous: true'
>> 
>> so that X errors are reported immediately upon the offending requests
>> being issued.
>
> Should the above be run from the shell prompt or from GDB?  If the

>From GDB, of course.  Thanks.