[LyX/master] Give error if adding a branch that already exists

[Jürgen Spitzmüller]

Am Dienstag, dem 25.03.2025 um 14:08 +0100 schrieb Scott Kostyshak:
> > For the record, my next big project should be making some text
> > insets breakable at end-of-line. This will undoubtedly create many
> > issues, so I would not mind seeing 2.5 ship without it. 
> 
> I'm quite excited to see this feature!

Me, too. Would be an absolute killer.

-- 
Jürgen
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