Browser - Quick search - preserve selection

[InMyMind]

After "quick search" value is cleared, preserve selection and leave it in focus.
If multiple items were selected, leave selection on last item that user clicked.

The workaround to have such functionality before XnViewMP 1.5.0 was to open settings and to close them.
This caused search value in quick search to be preserved, but filtering was reset.
The good part is that selection was not cleared and selected item was in focus which allows to navigate to adjacent files.