"Search in alignment" option works wrong if collapsing mode is enabled

Collapsed sequence should be expanded when the search finds a pattern inside this sequence.

It should work for "Next" and "Previous" buttons.

Scenario:

1. Open "_common_data/scenarios/msa/ma2_gapped.aln".
2. Open "Search in alignment" option tab.
3. Set collapsing mode is enabled.
4. Set pattern to "TTATT".
   Expected result: pattern is selected in "Bicolorana_bicolor_EF540830" sequence.
5. Click the "Next" button.
   Expected result: pattern is selected in "Conocephalus_discolor" sequence.
6. Click "Next".
   Expected result: Collapsed node is expanded and next pattern is selected in "Conocephalus_sp. " sequence.
   Actual result:* the selected pattern in "Podisma_sapporensis" sequence equals to "AGAAT" instead of "TTATT".