bug#37829: 27.0.50; Overlay behaviour changed without documentation.

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> Crystal ball says it's because the mode-line face doesn't have the
> :extend attribute by default.  If so, this change _is_ in NEWS and in
> the ELisp manual.

Hasn't there been sufficient fallout now from this change that we should
consider doing the :extend stuff the opposite way?  That is, default to
the old behaviour, and if we want certain faces not to extend, then we
put in :extend nil on those faces.

This change breaks a lot of out-of-tree code.

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