Created attachment 32838 [details] PDF showing adjacent squares The attached pdf illustrates the problem. View it with okular or evince and you will see a line appear between the squares at certain zoom levels (i.e. 60% in okular). There are 3 examples in the PDF: A) Two filled squares on a black background (the line is dark red) B) Two filled squares on white background (the line is pink) It seems the line is produced by antialiasing not taking into account adjacent objects, just the background. C) These two squares are produced using both fill & stroke (with a stroke width of zero). The separating line does not appear (at any zoom level) and the amount of antialiasing is 50% of what it was.
If Okular also suffers from the problem, it's obviously not a cairo backend only problem
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