Scenario to reproduce:
- Open "_common_data/clustal/test_1393.aln".
- Show simple overview.
- Select whole alignment.
Expected state: whole simple overview is filled with a selection rect.
- Click "Align sequence to this alignment" button on the tool bar and select "data/samples/fastq/eas.fastq".
Expected state: sequences are added, two of five sequences are selected both in the sequence area and simple overview.
Current state: sequences are added, two of five sequences are selected in the sequence area, but the simple overview if filled with a selection rect like whole alignment is selected.