Comment 5 for bug 1437726

Bug 1390569 suggests that this could be a Cairo bug introduced between 1.10 and 1.12. The bug doesn't appear in rsvg-convert. However, Inkscape is scaling the pattern up by a factor of 100 in order to better render patterns with non-integer pixel widths or heights. (Cairo requires patterns to have integer width and height.) If I change the scale factor from 100 to 1 (SUBPIX_SCALE in cairo-render-context.cpp) the test pattern renders as expected.

I believe this is a Cairo bug.