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

[Jürgen Spitzmüller]

Am Montag, den 13.01.2020, 12:34 +0100 schrieb Kornel Benko:
> Looking at the backtrace, I think it has to do with change tracking.
> ...
> #0  0x00000000007ed966 in lyx::InsetText::isChanged(bool) const

As I said, it looks like 4a4ded2297e which introduced
Inset::isChanged()

Jürgen
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