bug#42943: 28.0.50; Emacsclient crashes in ftcrfont_glyph_extents

[Robert Pluim]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Robert Pluim <rpluim@gmail.com>
>> Cc: contovob@tcd.ie,  larsi@gnus.org,  42943@debbugs.gnu.org
>> Date: Sat, 24 Oct 2020 17:41:36 +0200
>> 
>>     >> OK, so when we are about to release a font, we need to go over all the
>>     >> LGSTRING objects in gstring_hash_table, and remove from that cache
>>     >> every LGSTRING whose LGSTRING_FONT object holds the font we are about
>>     >> to release.
>> 
>>     Eli> Here, does the below give good results?
>> 
>> I should really hit 'g' in Gnus before writing patches :-)
>> 
>> That fixes it as well.
>
> OK, thanks.  (I think clearing the entire cache of gstrings is too
> radical: we don't necessarily remove all the fonts from all the
> frames.)
>

Right

> Now the important question: should we install this on master or on the
> release branch?  I believe the problem is not limited to 28.0.50, is
> it?  OTOH, is this safe enough to install on emacs-27?

I can't reproduce this crash on emacs-27 built with Cairo + Harfbuzz
at all.

Robert

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