Gdk/Gtk Win32 patch

[Hans Breuer <hans breuer org>]

Due to recent changes in Gdk (Thu Feb 24 18:11:46 2000  Owen Taylor) 
the Win32 part in CVS was slightly broken. 

This patch addresses the following issues:

make it compile again:
* adding some headers and define new required functions like
  _gdk_windowing_window_queue_antiexpose, rename some other
  like  gdk_window_clear_area -> _gdk_windowing_window_clear_area
* extend and change region specific functions, as required by
  Owen's changes. BTW: these are incompatible changes, which
  break some existing code (e.g. Dia). Shouldn't this comment go 
  into Changes-1.4.txt?
* do appropriate makefile changes (MSVC only)

make it run again (mostly):
* added GDK_NOTEs here and there to better understand why and where
  the crashes occure. This was especially usefull because the
  Win32 port does not run as MSVC5 Debug Built since a while - possibly
  due to mysterious race conditions while creating windows.
* finally testgtk was working again - except GtkLayout - but all
  menues are drawn in black, IHMO because of wrong paint order
  related to backing store (Just another race condition?)
* by temporary diabling the backing store facility 
  (#ifdef USE_BACKING_STORE) testgtk and gimp seem to work as 
  expected

Unresolved Issues and some Questions:
--------------------------------------
On Linux and Win32:
- testrgb's final stripes aren't visible (on Linux and Win32), 
  because they are flushed with black. 
  Is this a feature - or a bug ?

- I wasn't able to find enough documentation to understand
  what _gdk_windowing_window_get_offsets is expected to do.
  Could someone give me an explanation, or even better put
  it into the sources?

- Is there general design documentation (e.g.: Signal Handling,
  Backing Store) available and/or list of known possible race 
  conditions, which could help to resolve the remaining 
  issues?

Because of it's size (8K) the patch is not attached, 
but available at:

http://Hans.Breuer.org/gtk+dev-2000-05-01-hb.zip 

Thanks in advance,
	Hans
-------- Hans "at" Breuer "dot" Org -----------
Tell me what you need, and I'll tell you how to 
get along without it.                -- Dilbert