Added manual rotation to the GroundOverlayFrame in edit mode.
Review Request #123259 - Created April 5, 2015 and submitted - Latest diff uploaded
Until now it wasn't possible to rotate the GroundOverlayFrame manually, only from it's properties menu, setting the angle in a spinbox.
This patch introduces a user-friendly manual rotation in edit mode, as well as new icons(thanks to Torsten Rahn) which are shown as handles around it's edges and corners.
Also, a bug was fixed in this patch: the GroundOverlayFrame wasn't able to capture the mouse events that occured outside of it's regions while a controlpoint(handle) was grabbed.
Testing was done by me and it works fine.