filewidgets/kfilewidget: Select and focus filename after canceling overwrite
This ensures that the filename can be typed immediately after pressing the save button and cancelling an overwrite. BUG: 444515
(cherry picked from commit cff4ec75)
This ensures that the filename can be typed immediately after pressing the save button and cancelling an overwrite. BUG: 444515
(cherry picked from commit cff4ec75)