bug#42943: 28.0.50; Emacsclient crashes in ftcrfont_glyph_extents

[Robert Pluim]

>>>>> On Sat, 24 Oct 2020 17:48:26 +0300, Eli Zaretskii <eliz@gnu.org> said:

    >> Date: Sat, 24 Oct 2020 17:12:04 +0300
    >> From: Eli Zaretskii <eliz@gnu.org>
    >> Cc: contovob@tcd.ie, larsi@gnus.org, 42943@debbugs.gnu.org
    >> 
    >> >   s->font = XFONT_OBJECT (LGSTRING_FONT (lgstring)); <----
    >> > 
    >> > so itʼs the caching in the Lisp_Object for the composition thatʼs
    >> > causing the problem.
    >> 
    >> 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.

Robert
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