Major 1. Open "_common_data/scenarios/msa/ma.aln".
2. Click the "Enable collapsing" button on the toolbar.
Expected state: there are two collapsed groups.
3. Try to select some area in the Sequence area or in the NameList area (selection start must be in the white space under sequences).
Expected state: Region from the bottom to the selection end point is selected.
Unexpected state: Region from the any previous clicks to the selection end point is selected.
4. Try to click to the white space under sequences.
Expected state: Only one symbol is selected.
Unexpected state: Selection contains more than one symbol.