Major 1. Open file "data/samples/CLUSTALW/COI.aln"
2. Set any sequence as a reference via a context menu
3. Open the "Statistics" tab in the Options panel
Expected state: reference sequence is shown in the "Reference sequence" section
4. Close the Options panel
5. Set any other sequence as a reference via a context menu
6. Open the "Statistics" tab in the Options panel
Expected state: new reference sequence is shown in the "Reference sequence" section
Current state: previous value is displayed
