LivelyKernel/LivelyKernel — pull request #76 by levjj (2012-11-30 01:07:06+00:00)
Title: Drag and drop restrictions

This patch enable any morph to restrict the morphs it can be dropped into and the morphs it accepts as dropped submorphs.

This can be very useful for games which rely on drag-on-drop of game elements and it can also be used to enforce that windows can only be dropped into the world and not into other morphs.