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bug#39865: 28.0.50; Emacs crash

From: Robert Pluim
Subject: bug#39865: 28.0.50; Emacs crash
Date: Tue, 10 Mar 2020 15:29:44 +0100

>>>>> On Fri, 06 Mar 2020 19:53:32 +0200, Eli Zaretskii <address@hidden> said:

    >> From: Vinicius José Latorre <address@hidden>
    >> Date: Fri, 6 Mar 2020 14:20:42 -0300
    >> Cc: address@hidden
    >> > OK, then the crash is a known problem: you cannot change the font
    >> > backend once the session started, you can only do that in X resources.
    >> > Previously, XFT was your original backend, but now it's HarfBuzz.
    >> I think that emacs should be more robust about this and do not crash for 
any bad value.

    Eli> I agree.  It is not a bad value, we just couldn't yet find a way of
    Eli> switching the font-backend.

Eli, would you accept a patch for emacs-27 that signals a user-error
if trying to set a font-backend thatʼs not supported by the running
emacs? Or that ignores it (with a message)?


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