QFileDialog::getSaveFileName to update the name field

QFileDialog::getSaveFileNamed does not update the file extension when the user changes the selected filter.
If the user types "foo.tif" in the "File name" field and then changes the filter to "*.jpg", it would be nice if the extension .tif would be removed from the file name. Currently, instead of leaving the name as "foo" without any extension, the file name still shows "foo.tif".