[Webkit-unassigned] [Bug 235420] New: Position:fixed layers shouldn't allocate a backing buffer if all children are offscreen

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=235420

            Bug ID: 235420
           Summary: Position:fixed layers shouldn't allocate a backing
                    buffer if all children are offscreen
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: m_woodrow at apple.com
                CC: simon.fraser at apple.com,
                    webkit-bug-importer at group.apple.com

rdar://86612099

Layers for position:fixed content can't scroll, so any descendants that don't intersect with the compositing bounds of the layer shouldn't be included when we're determine if we need a backing store.

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