[LyX/master] Add +/- buttons to zoom slider

[Jürgen Spitzmüller]

Am Donnerstag, dem 11.03.2021 um 16:26 +0100 schrieb Jean-Marc
Lasgouttes:
> Yes, but we need a way to reset zoom to default.

I'll implement a context menu. The ticks were not really helpful in
this case anyway (as the slider did not snap at the ticks).

Jürgen

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