Decided not to change the default window title of a MsgBox() on Windows for now. If I change my mind, it's a documentaiton change =P
Fixed resizing of editable comboboxes in the GTK+ backend. Uneditable comboboxes are still an issue, and there's experimental code to try to fix them, but it doesn't work...
Fixed the GTK+ Combobox sizing issues for real this time.