[bug #27782] drawInRect:fromRect:operation:fraction: doesn't work correctly in a flipped view

[Quentin Mathé]

Follow-up Comment #7, bug #27782 (project gnustep):

The test application you mention isn't listed in the attachment section. Can
you try to upload it again?

For xlib, art and cairo, scroll views work well for me with the patch. I did
more tests in various applications and the scrolling seems to be fine. So I
suppose copying gstate isn't broken by the patch.
The composite-test in GSTest looks ok too.

I spent some time testing the patch more thoroughly. 
Everything works great in art. 
For xlib, drag images appears as plain gray images rather than what you
expect (e.g. a button image when you drag a button from a Gorm palette).
For cairo, there are two bugs currently. Image drawing is shifted downwards
in drag images and a similar issue also appear in outline/table view image
cells. I haven't tried to fix them yet.

Could you test the windows backend or should we ask somebody else?

Aside of that I also added an assertion (in the main composite method) which
seems too strict: Gorm reports it in the console when you run it with the
patch applied to Gui.

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