Blender Git Loki

Fix [#22088] Object's material changes (links) to other when moving an object
to an other layer

WM_operator_props_popup() and subsequent block handle function redo_cb()
was popping an operator undo, without having pushed one previously -
this would undo one too many times when using the properties invoke popup.

Fixed by adding an undo push to WM_operator_props_popup()