2006-12-01 Rolf Bjarne Kvinge <RKvinge@novell.com>

2006-12-01  Rolf Bjarne Kvinge  <RKvinge@novell.com>

	* MdiWindowManager.cs:
	- Set form to active mdi child if shown,
	and update the active mdi child to the next
	remaining child in the z-order if the form is hidden.

	* Form.cs:
	- Track if the form has been visible and if its
	visibility is beeing changed, so that the MdiClient
	can properly decide the ActiveMdiChild. The MdiClient
	cannot track this since the form can change visibility
	before MdiClient is created.

	* MdiClient.cs:
	- Don't activate anything of the parent form is changing
	its visibility.
	- Rework ActiveMdiChild to only return visible mdi
	children and take into account several other corner
	cases.

svn path=/trunk/mcs/; revision=68836