bug#51577: 27.2; Regression: reproducible hang with face functions

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> It's only later, when the code does this:
>
>     (apply #'set-face-attribute 'region frame plist)))
>
> that it actually makes the 'region' face inherit from itself.

Well...   then we could do a check in `set-face-attribute' (too)?

> Similarly, inheritance loops can (and usually do) appear at run time,
> because faces are added or their attributes modified or merged with
> other faces.

Hm...  will merging lead to loops?

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