[patch] regwin highlight fixes

[Martin M. Hunt]

This improves highlighting of changed values when switching register
groups.

2002-12-18  Martin M. Hunt  <hunt@redhat.com>

	* library/regwin.itb (RegWin::update): When updating, check
	that a cell still exists before checking its value.
	(RegWin::_select_group): Clear cells with changed values before
	changing group.  After new group is selected, highlight any 	changed
values still visible.



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