bug#40733: 28.0.50; Emacs locks up on paste (yank) of unicode characters

[Robert Pluim]

>>>>> On Wed, 29 Apr 2020 07:42:20 -0500, Will Bush <will.g.bush@gmail.com> 
>>>>> said:

    Will> Did you see my other message that I forwarded where I forgot to CC
    Will> everyone? I
    Will> was able to switch between a bunch of revisions of the master branch 
to see
    Will> where the performance issue started, and it appears to have started 
with
    Will> commit
    Will> (88efc736f5 Default cairo to enabled). I was hoping that would narrow 
it
    Will> down.
    Will> Maybe an upstream bug needs to be reported.

How many fonts do you have installed in the slow case? Is it possible
that 'fc-cache' needs to be rerun? (I have about 3000 installed here).

Robert