Using a queued connection fixes a problem when using kfilewidget and the url navigator is in editable mode:
- Open kwrite. Open a folder with lots of files, open a file that is at the left more or less.
- Now reopen the open/save dialog, if the url navigator is on edit mode, the view moves to the end, while if it is on breadcrumb mode, it works fine.

Also some other cosmetic changes.