When editing dives, the undo-command sends a filte changed signal.
The models catch the signal and check whether the filter status
changed.
The mobile-version of the dive-edit command simply exchanged the
dives. This could lead to inconsistencies when the filter flag
was overwritten. Therefore, make sure that the filter flag
is not overwritten by the dive-exchange.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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