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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Question about composite.c
Date: Sat, 25 Apr 2020 18:23:09 +0300
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To: Gerry Agbobada <gagbobada@gmail.com>
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 (message from Gerry Agbobada on Sat, 25 Apr 2020 15:53:49 +0200)
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> From: Gerry Agbobada <gagbobada@gmail.com>
> Date: Sat, 25 Apr 2020 15:53:49 +0200
> Cc: Emacs developers <emacs-devel@gnu.org>
> 
> I can confirm the bug is fixed by
> commit fe903c5ab7354b97f80ecf1b01ca3ff1027be446
> Author: Eli Zaretskii
> Date: Sat Feb 8 15:41:36 2020 +0200
> Allow composition of pure-ASCII strings in the mode line
> 
> * src/composite.c (Fcomposition_get_gstring): Allow unibyte strings if
> they are pure
> ASCII, by copying text into a multibyte string.

Thanks, that was my guess.

> If it's possible to backport this commit in emacs 27 I think it would
> save a lot of headaches.

Sorry, the change is somewhat risky, and that's why it went to master.