In System.Windows.Forms:

In System.Windows.Forms:
	[ totally cosmetic eye-candy feature, fixes bug #80089 ]

	* Form.cs: only call the XplatUI transparency method (get/set) if
	SupportsTransparency says it's supported. Otherwise fallback to
	doing nothing (in the set case) or returning the instance field we
	cache (in the get case).

	* XplatUIStructs.cs: add TransparencySupport flag enum.

	* XplatUIDriver.cs: add abstract GetWindowTransparency, and track
	change to SupportsTransparency.

	* XplatUIOSX.cs: stub out GetWindowTransparency, and return
	TransparencySupport.None from SupportsTransparency.

	* XplatUIX11.cs: Stub out GetWindowTransparency, and return
	TransparencySupport.Set from SupportsTransparency.

	* XplatUIWin32.cs: implement GetWindowTransparency calling
	GetLayeredWindowAttributes, and implement SupportsTransparency by
	checking whether or not both
	GetWindowTransparency/SetWindowTransparency are available
	entrypoints.  We need to do this since SetWindowTransparency is
	available as of win2k, but GetWindowTransparency requires winxp.
	yay win32 api.

	* XplatUI.cs: Add GetWindowTransparency, and change
	SupportsTransparency to allow for either/both Get/Set.

2006-11-29  Chris Toshok  <toshok@ximian.com>

In System.Windows.Forms.X11Internal:
	* X11Hwnd.cs: implement GetWindowTransparency, and also add
	caching for WINDOW_TYPE and _NET_WM_WINDOW_OPACITY.  We invalidate
	the cache when we get a PropertyNotify on that atom.

	* X11Display.cs: return GetSet from SupportsTransparency if we
	have a compositor running.  otherwise return None.

	* XplatUIX11-new.cs: pass SupportsTransparency off onto the
	X11Display, and pass GetWindowTransparency off onto the X11Hwnd.

2006-11-29  Chris Toshok  <toshok@ximian.com>

svn path=/trunk/mcs/; revision=68722