Undoing drag and drop material assignment

[Olby]

Steps:

1. Create a cube, fit & lock a texture on it
   
2. Duplicate the cube
   
3. Make all dupes children of a single cube
   
4. Drag and drop different materials onto cubes
   
5. Now try undoing the material assign operation (ctrl+z)
   

 

Undo will completely remove any material from the objects (turns them white) and more so will mess up the (locked) UV layout.

 

(animation)

[Josh]

This is happening because the undo step tries to apply an entity-level material to the brush, and since none exists it goes blank. I need to add some additional functionality to handle the face materials when this is happening.