FolderListModel - changing nameFilters shows still one filename from the previous filter

When you change the name filter from one to another in FolderListModel the last filename of the previous listing overwrites the last item of the new listing iff the new listing has more items than the previous one.

The attached example demonstrates the problem. Press the buttons in order from top to bottom. The 'text.txt' stays as the last item on the list even if the filter is '.png' and it can be found twice when the filter is ''.