Berthold Stoeger 3b6b9951ae undo: clear undo-stack when clearing dive data
When the dive data is cleared, all pointers in the undo-stack become stale.
Desktop explicitly called Command::clear() in that case, but mobile doesn't.
Thus, move the clear() call into DiveTripModelBase::clear()

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
2020-03-10 09:25:49 -07:00
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