Wrong SV updates on Wrap mode change

Scenario:

1. Open "_common_data/fasta/fa1.fa", make the Details View visible.
   Current state: wrap mode is on by default, the view is fine
2. Disable the wrapping mode.
   Current state: the sequence is displayed at the bottom of the view or even not visible at all (depends on the widget size). Hiding and showing the Details View again restores the view.
   Expected state: the sequence is fully visible.