[Webkit-unassigned] [Bug 198364] New: Backing store attachment logic for composited-inside-scroller needs to account for non-ancestor scrollers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198364

            Bug ID: 198364
           Summary: Backing store attachment logic for
                    composited-inside-scroller needs to account for
                    non-ancestor scrollers
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

We generally inflate the coverage rect for composited scrollers (e.g. bug 198363) so that composited descendants get backing store attachment before they are scrolled into view.

However, with a non-stacking context scrollers, descendants don't see the scroller's coverage rect, so we need another way to inflate their coverage.

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