bug#62847: 29.0.90; Propertized space in Org Agenda's mode-name

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: mattiase@acm.org, monnier@iro.umontreal.ca, gusbrs.2016@gmail.com,
>  62847@debbugs.gnu.org
> Date: Sun, 16 Apr 2023 13:14:51 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> Side note: It might be interesting to have something similar to
> >> `add-variable-watcher' and `debug-on-variable-change', but for mutable
> >> objects being modified.
> >
> > Propertizing a string doesn't mutate the string itself, though.
> 
> You mean the char vector representing a string? But doesn't the real
> string object also include the plist?

It includes a pointer to the string's intervals, which is where the
properties are recorded.