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bug#39865: 28.0.50; Emacs crash

From: Eli Zaretskii
Subject: bug#39865: 28.0.50; Emacs crash
Date: Tue, 10 Mar 2020 16:52:04 +0200

> From: Robert Pluim <address@hidden>
> Cc: Vinicius José Latorre <address@hidden>,
>   address@hidden
> Date: Tue, 10 Mar 2020 15:29:44 +0100
>     >> 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)?

In general, yes; but I'd need to see the patch.

AFAIU, the problem in this case wasn't that the backend wasn't
supported, it was that it was changed in the middle of a session.

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