[Webkit-unassigned] [Bug 215443] New: Move scroll / overflow handling out of RenderLayer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215443

            Bug ID: 215443
           Summary: Move scroll / overflow handling out of RenderLayer
           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: zimmermann at kde.org
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Per recent discussions between Igalia / Apple, it would be nice to split up RenderLayer into a lean, base class and a derived class which contains all scroll / overflow handling ("RenderLayerScrollable").

I propose to first move all scroll / overflow handling from RenderLayer to RenderLayerScrollable, and as next step only create RenderLayerScrollable objects if needed -- this should be a performance progression for many scenarios.

I'll upload an initial draft patch to discuss the design.

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