With points selected in more than one edited layer the transform box now
wraps them all, in the page's axes since the layers can be turned
differently. Its corners and edges scale them, outside a corner rotates
them and inside drags them; each layer's points are mapped in its own
coordinates and the whole drag is one undo step. A click inside clears
every layer's points.
Marco Arnulfo
1f2a8104bf