from preamble:

"Change Set:		BrowserRedrawFix
Date:				6 August 2003
Author:			Ned Konz

Fixes the redrawing bug in the SystemBrowser (redraw didn't remove the
focus rectangles).

But only invalidates the focus rectangles, so we don't have to do a full
redraw.

Since we're always grabbing keyboard focus on mouseEnter, removed
conditional in mouseLeave. This will prevent a PLM from responding to
keyboard events once the mouse has left its bounds."!
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