from preamble:

"Change Set:		UpdatingMenuRefreshFixV3-nk-md
Date:			30 Sept 2003
Author:			Ned Konz

This CS keeps updating menu item morphs with checkboxes from repeatedly
redrawing.

version 2: fixes non-check boxes too.
version 3: MCP changed == nil to isNil, this change does this, too (md).
"!
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