Mapping for mouse events considering transforms
if as mouse delta we only consider deltas of scene positions, those will not be transformed, and if the whole appletslayout is scaled (ie edit mode) the applet will be dragged not considering the scale, not keeping it fixed uder the mouse
(cherry picked from commit 58a0bbc6)
58a0bbc6 Mapping for mouse events considering transforms
Co-authored-by: Marco Martin notmart@gmail.com