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

[Kornel Benko]

Am Mon, 13 Jan 2020 09:34:31 +0100 (CET)
schrieb Juergen Spitzmueller <spitz at lyx.org>:

> commit adfd38e4efd1180df164fa2c75cf15210f366e94
> Author: Juergen Spitzmueller <spitz at lyx.org>
> Date:   Mon Jan 13 09:48:56 2020 +0100
> 
>     Fix backspace deletion of selected items with change tracking
>     
>     Move cursor at beginning of selection after deletion. Else backspace
>     operation gets stuck in a loop (tries to remove the selection again
>     and again).
>     
>     This also fixes backspace deletion of insets with confirmDeletion() == true.
>     
>     Fixes #11630

After the last commits many of the dvi-tests are failing.
ctest -R dvi3
55% tests passed, 270 tests failed out of 605

ctest -R 'dvi$'
55% tests passed, 143 tests failed out of 320

For instance for export/tabletemplates/Grid_with_Head_1x2_dvi

lyx: SIGSEGV signal caught!

	Kornel
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