from preamble:

"Change Set:		OBDragAndDropFix
Date:			26 February 2005
Author:			Alexandre Bergel

Dragging a method from a method pane over the class or class categories
pane trigger a DNU. The reason is that a node is not always returned
from OBColumn>>nodeForDroppedMorph: transferMorph event: evt inMorph:
listMorph

This fix solves this bug, but I feel that the problem is deeper than
that..."!
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