If a File Filter change removes from the dispaly one of more than one selected files, the selction is reduced by one as expected.
If it removes the only selected file, it is not reduced by one as expected (the next line down is selected). I suggest it should be i.e. should leave zero files selected.
If it removes the only selected file, it is not reduced by one as expected (the next line down is selected). I suggest it should be i.e. should leave zero files selected.