View rotation issues since matrix redesign
Since #722, rotating a view with meta-key + middle click has two problems:
- the rotation is the opposite size from what it used to be/I'd expect, e.g. if I do a circle clockwise the view will rotate counter-clockwise.
- The decoration doesn't follow rotation properly, the coordinate system must have changed a bit (an upside-down view is correct, but a view at 45° will touch the outside of the decoration)