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Transforms are containing blocks for fixed-pos items, so if a fixed-pos item is inside a scrolled transform, then it should use that scrollframe as the scroll target for hit-testing. This patch handles this case for WebRender by stashing the appropriate ASR on the nsDisplayFixedPosition item and using it instead of the presShell's root scrollframe in this scenario. The patch also adds a mochitest (which is basically a mochitested version of the reftest in fixed-pos-scrolled-clip-3.html, with a hit-test check to ensure that it's hitting the right scrollframe). MozReview-Commit-ID: 7YQAeOiMMuP --HG-- extra : rebase_source : 8d1c89d0c03c3e7d9383d0731f65a327a2c11a8d |
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