[LyX/master] Fix backspace deletion of selected items with change tracking

[Jürgen Spitzmüller]

Am Montag, den 13.01.2020, 12:08 +0100 schrieb Jürgen Spitzmüller:
> Am Montag, den 13.01.2020, 11:32 +0100 schrieb Kornel Benko:
> > For instance for export/tabletemplates/Grid_with_Head_1x2_dvi
> > 
> > lyx: SIGSEGV signal caught!
> 
> JMarc, this looks like yours:

This should be fixed. JMarc, please check if it makes sense to you.

Jürgen
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