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On GTK > 2.18 with certain versions of X (seen on 1.10.1 and 1.9.5 to date), calling fillGradientRectangle will result in screen cheese.
Created attachment 195548 [details] Snippet Here is a snippet that draws 2 rectangles - one red one, and then a gradient one on top of the red one. The red rectangle should be one pixel larger than the gradient one and there is a loop that increments the size by one for each line. You will see that for some sizes some black is drawn at the end of the gradient rectangle.
Created attachment 195549 [details] Pic
Moving to RC3.
Created attachment 196482 [details] Proposed Patch Patch that adds property to turn Cairo on for all GCs
Fixed in HEAD > 20110524
I don't see the black lines at the end of stacks any more with I20110526-0630 PW
FWIW I don't see the black lines at the end of the stacks with a 3.6 SWT or with a 3.7RC1 SWT. I'm on gtk2-2.24.4-1.fc15.x86_64.