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

[Jürgen Spitzmüller]

Am Montag, den 13.01.2020, 17:45 +0100 schrieb Jürgen Spitzmüller:
> We could color the lines of the
> added/removed columns/rows blue or red.

Coloring now done. Ideally, deleted rows/columns should be struck-out
as we do for deleted tables. But I don't know how to do that.

Jürgen
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