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

[Fred Kiefer]

Follow-up Comment #5, bug #27782 (project gnustep):

I wont have time to look at the patch until next week, but removing the
doublication in the different drawing methods is surely agood thing. I had the
code in place for a long time, but never dared to switch to it.

Could you please check that copying from one gstate to another (or the same)
still works as expected? One simple way to test this is to use a scroll view.
There also is an old test that checks quite a few different drawing methods
at once.
I need to dig that up.

Before the patch gets submitted we need to make sure that the other backends
at least don't work less then before. This may require some additional work. 

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