[Webkit-unassigned] [Bug 179946] New: ScrollingStateNode::reconcileLayerPositionForViewportRect is only called on direct children of the root

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179946

            Bug ID: 179946
           Summary: ScrollingStateNode::reconcileLayerPositionForViewportR
                    ect is only called on direct children of the root
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Frames
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr
                CC: dvoytenko at google.com, simon.fraser at apple.com
            Blocks: 154399

Created attachment 327452

  --> https://bugs.webkit.org/attachment.cgi?id=327452&action=review

Testcase

AsyncScrollingCoordinator::reconcileViewportConstrainedLayerPositions has the following comment:

// FIXME: We'll have to traverse deeper into the tree at some point.
for (auto& child : *children)
     child->reconcileLayerPositionForViewportRect(viewportRect, action);

I'm not sure whether this is affecting bug 154399 but the attached testcase shows that reconcileLayerPositionForViewportRect is not called on the fixed node when one scrolls the main frame.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=154399
[Bug 154399] Position fixed is buggy with overflow:auto scrolling inside iframes
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