1. Open "samples/CLUSTALW/COI.aln".
2. Use Alignment Viewer context menu -> View.
Expected: "Show offsets" option is enabled.
3. Open "_common_data/clustal/big.aln".
4. Use Alignment Viewer context menu -> View.
Expected: "Show offsets" option is enabled.
Current: "Show offsets" option is disabled.
The option works only for alignments with the length less than 3000 bp. Investigate the restriction and try to avoid it.