GNU bug report logs - #74091
31.0.50; string-pixel-width in mode line disables region

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: me <at> eshelyaron.com, 74091 <at> debbugs.gnu.org
Subject: bug#74091: 31.0.50; string-pixel-width in mode line disables region
Date: Sat, 09 Nov 2024 18:37:49 +0200

> From: Stefan Monnier <monnier <at> iro.umontreal.ca>
> Cc: Eshel Yaron <me <at> eshelyaron.com>,  74091 <at> debbugs.gnu.org
> Date: Sat, 09 Nov 2024 11:26:48 -0500
> 
> I suspect the problem might be a bug in `reset_buffer_local_variables` around:
> 
>     /* Reset all (or most) per-buffer variables to their defaults.  */
>     if (permanent_too)
>       bset_local_var_alist (b, Qnil);
> 
> I suspect this was OK in the "original" uses of `permanent_too` because
> "by construction" none of those vars could be "swapped in" (i.e. have
> their value held in a C variable like `Vdeactivate_mark`), but we now
> have cases where this is not the case any more, so that if the value of
> `Vdeactivate_mark` held a buffer-local value, it ends up "promoted"
> to global.

Which development in Emacs made such a "promotion" possible?

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