[LyX/master] Disable changebar checkbox if show changes in output is off

[Jürgen Spitzmüller]

Am Mittwoch, den 25.12.2019, 18:48 +0100 schrieb Kornel Benko:
> There is a problem if trying to use 'Use change bars in output'

Fixed. There's still a compilation problem with changes in output, but
this is unrelated and due to ERT deletion being tracked.

Jürgen
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