If the user clicked away from the source, while the transform dialog is open,
the whole dialog would be disabled. The user then couldn't click close or
press escape to close the dialog. The only way for them to close it was to
click on another source to re-enable it.
Fixes some QWidgets that Qt Creator tries to clobber. As a result, there is a new spacer added now to ensure the controls remain grouped at the top of the window.
Some widgets are marked as native unnecessarily. Native widgets are
a bit more involving than regular ones, so remove this flag.
Original patch by David Edmundson <kde@davidedmundson.co.uk>
