1. Open test/_common_data/clustal/10000_sequences.aln
2. Delete some area.
3. Press "save alignment" button on toolbar
Expected state: document became locked for few seconds
4. While document is locked, click on it and press delete.
Bug state: save file message box appeares. Press no.
UGENE crashes
failed test:
GUITest_common_scenarios_msa_editor_test_0049 on windows