[Mono-winforms-list] [Patch] Invalidate non visible areas in scrolling

[Carlos Alberto Cortez]

Hey Chris,

Attached is an updated patch that basically incorporates all the things
you mentioned in your last mail:

* Determines the visible rectangle, and intersects it with the required
area (this is, we copy only the visible area).
	- First by determining the visible area based on its size and its
parents.
	- Second, by looking for toplevel windows that intersect the window,
and excluding that area.

* Then compute the destination rectangle, by applying the
XAmount/YAmount values and intersecting it with the area passed to
ScrollWindow (thus we clip it as needed). This is the way Gdk does it.

* Finally, exclude the destination rectangle from the total requested
area, and pass it to AddExpose method.

With this patch everyting is working as expected, but I have some
issues:

* Region needs a Graphics instance to return its Bounds, which *could*
be expensive.
* After taking a look at the way scrolling is done in Gdk, it *seems*
that the Region implementation lack some of the functionality we need
(like, returning in a simple operation the Rectangles describing the
region).

Comments?

Carlos.
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