from preamble:

"Change Set:		FasterMouseOver-nk
Date:			11 July 2003
Author:			Ned Konz

My system was spending *lots* of time when I moved the mouse over list
morphs.

I have a newer VM that reports a stream of identical mouse points,
apparently; this change set filters out mouseOver handling for
subsequent identical points.

v2: use isEmpty so as not to annoy MCP
"!
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