[Webkit-unassigned] [Bug 164855] New: [iOS WK2] When zoomed in and panning on pages with fixed bars, parts of the bars are sometimes missing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164855

            Bug ID: 164855
           Summary: [iOS WK2] When zoomed in and panning on pages with
                    fixed bars, parts of the bars are sometimes missing
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: simon.fraser at apple.com

On a page like http://smfr.org/misc/four-bars-shadows.html, if you zoom in and pan around, bits of the bars are sometimes missing.

This happens when they get into tiled mode, but we fail to update the tiles during scrolling.

This is related to https://trac.webkit.org/changeset/186155.

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