[Mono-dev] Patch for Managed Windows Forms on OSX

[matteo tesser]

Hi,
By trying to compare the osx windows.forms driver and the x11 one I
found that one  behavioral difference is present in the AddExpose
method. While under X11 AddExpose does not create explicitly  WM_PAINT
or WM_NCPAINT events but only signals the areas that are to be cleared
or drawn, the osx driver is obliged  specify a specific event. By
doing so it generates a different  Paint events order.

In the attachment I commit a patch that basically force the execution
of the drawing stack when a WM_PAINT and WM_NCPAINT event are both
present for the same window, allowing subsequent invalidated areas to
be paint on subsequent redraws in a paint event order closest to the
desiderated one.

By doing that at least in my test much more content is displayed
correctly and for example it fixes the following bug.
https://bugzilla.novell.com/show_bug.cgi?id=462024

best regards,
Matteo
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