[Webkit-unassigned] [Bug 162634] New: Add a second, pre-order updateGeometry() pass to the layer update.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=162634

            Bug ID: 162634
           Summary: Add a second, pre-order updateGeometry() pass to the
                    layer update.
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zalan at apple.com
                CC: simon.fraser at apple.com

And remove the workaround from RenderLayerBacking::updateAfterLayout()

    if (!compositor().compositingLayersNeedRebuild()) {
        // Calling updateGeometry() here gives incorrect results, because the
        // position of this layer's GraphicsLayer depends on the position of our compositing
        // ancestor's GraphicsLayer. That cannot be determined until all the descendant 
        // RenderLayers of that ancestor have been processed via updateLayerPositions().
        //
        // The solution is to update compositing children of this layer here,
        // via updateCompositingChildrenGeometry().

(We need to position the parent graphics layer in order to be able to compute the correct descendant graphics layers positions.)

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