Description of Problem:
Sometimes Gettext Editor's list shows the identical strings multiple times. It's somehow connected to the filter, because removing a char and restoring it back sometimes resolves the problem.

Steps to reproduce the problem:
1. Open a big po file (e.g.: one of the po files of MD project)
2. Try defining filters which gives results


Actual Results:
Sometimes you're seeing the identical strings multiple times.

Expected Results:
You always should see the strings just once.

How often does this happen? 
Sometimes

Additional Information: