Minor 1. Open "data/samples/CLUSTALW/COI.aln".
2. Select whole msa.
3. Shift it with mouse.
4. Press delete key.
Expected state: nothing happens (whole msa couldn't be deleted).
Current state: UGENE crashes (selection is successfully deleted).
1. Open "data/samples/CLUSTALW/COI.aln".
2. Select whole msa.
3. Shift it with mouse.
4. Press delete key.
Expected state: nothing happens (whole msa couldn't be deleted).
Current state: UGENE crashes (selection is successfully deleted).
