[Patch] consider overflow in selection repaint rectangles

[Leo Savernik]

Hello,

Blocks with an overflowWidth/overflowHeight didn't have their selections 
updated appropriately. I fixed this by using overflowWidth/overflowHeight in 
render_canvas.cpp's enclosingPositionedRect where necessary.

I wonder if this is correct wrt to layers (overflow:scroll).

I furthermore wonder if WebCore suffers from the same problem, or if it solves 
the repaint issue in another way.

Please see the testcase for further information.

mfg
	Leo
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