[Webkit-unassigned] [Bug 227285] New: [WPE] Clipping for overflow scrolled content appears different with async overflow scrolling enabled in css grid

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Jun 23 02:34:05 PDT 2021


https://bugs.webkit.org/show_bug.cgi?id=227285

            Bug ID: 227285
           Summary: [WPE] Clipping for overflow scrolled content appears
                    different with async overflow scrolling enabled in css
                    grid
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clord at igalia.com
                CC: bfulgham at webkit.org, rego at igalia.com,
                    simon.fraser at apple.com, zalan at apple.com
            Blocks: 224596

I'm not sure if this is a side-effect of fractional coordinates, a bug specifically in the WPE(/GTK) layer rendering or a bug in layout/rendering, but there appear to be 1-pixel differences in clipping in some situations, where the clip rectangle seems too tall. I expect this bug won't be WPE-specific or CSS grid-specific, but I'm labelling this bug as such until I have confirmation.

This is causing imported/w3c/web-platform-tests/css/css-grid/grid-model/grid-container-scrollbar-vertical-lr-001.html and at least the rl variant of the same test to fail on WPE (which runs these tests with async overflow scrolling enabled).


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=224596
[Bug 224596] [WPE] Several scroll related tests are failing since r275593
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