[Webkit-unassigned] [Bug 196039] New: Detect when layers can behave as a stacking container, to reduce layer explosion

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196039

            Bug ID: 196039
           Summary: Detect when layers can behave as a stacking container,
                    to reduce layer explosion
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

In some cases it's beneficial to treat layer as a CSS stacking context even if it isn't one, so that we create fewer descendant compositing layers.

This will involve bringing back code similar to the code I removed in r236424 and r236611.

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