bug#48841: bug#47711: [PATCH VERSION 2] Add new `completion-filter-completions` API and deferred highlighting

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> How can that work if at display time all the "planes" are combined?
> It would mean that the code which produced the original strings will
> get them displayed differently after completion.

That's in the font-lock context, where font-lock will do faces on its
"plane" while other packages can do faces on their own "planes", and
they'll be combined on display.

It not relevant in the context of this bug report, but I thought I'd
just mention the general design.

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