One more thing I need to sort out here before landing: Try showed a webrender-only subtest failure for printpreview_images.html, with data URIs shown in the attached screenshot. Sample failure log: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=313226376&repo=try&lineNumber=106462 It's a real misrendering on the border between some elements, it looks like, and it's almost certainly an existing bug that happens to be exposed with the particular zoom factor that we use as a result of the two patches here. It may be something I can work around for now with some fuzzy allowance in the test's comparison (I think the comparison API that we're using supports fuzzy mismatches...)
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One more thing I need to sort out here before landing: that Try showed a webrender-only subtest failure for test_printpreview.xhtml's rendering of printpreview_images.html, with data URIs shown in the attached screenshot. Sample failure log: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=313226376&repo=try&lineNumber=106462 It's a real misrendering on the border between some elements, it looks like, and it's almost certainly an existing bug that happens to be exposed with the particular zoom factor that we use as a result of the two patches here. It may be something I can work around for now with some fuzzy allowance in the test's comparison (I think the comparison API that we're using supports fuzzy mismatches...)