Bug in randr/rrtransform.c : RRTrasnformCompute()

[Stirling Westrup]

I've noticed that the transformation matrices that this function builds for
rotated screens is not quite correct.

In particular, it consistently builds maps from 0 to width or height
instead of from 0 to width-1 or height-1.

This means that an inverted screen maps (0,0) to (width,height) instead of
(width-1,height-1). This causes out-of-boundary errors when mapping screens.



-- 
Stirling Westrup
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