Long enough pattern name is the cause of showing warning about too long pattern in "Find Pattern" widget

Scenario to reproduce:

1. Open "_common_data/fasta/fa1.fa".
2. Open "Find Pattern" options panel tab.
3. Enter a pattern:

   >just_a_pattern_name
   ac
   

   Expected state: there is a result, there are no warnings, if one click "create annotations" button there will be an annotation (with "just_a_pattern_name" if "Use pattern name" option is set).
   Current state: the same as expected, except the warning, that notifies about too long pattern.