[LyX/master] Implement InsetLayout::requiresPackage()

[Jürgen Spitzmüller]

Am Samstag, dem 08.06.2024 um 16:29 +0200 schrieb Jean-Marc Lasgouttes:
> Maybe required(name)?

We already have the required() member which returns the whole set.
requiresFeature(name)?

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Jürgen