[Webkit-unassigned] [Bug 275394] New: Fallback to fullscreen-layout happens when more than 1 subtree layout is pending

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=275394

            Bug ID: 275394
           Summary: Fallback to fullscreen-layout happens when more than 1
                    subtree layout is pending
           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: plampe at igalia.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 471658

  --> https://bugs.webkit.org/attachment.cgi?id=471658&action=review

demo

In the demo attached, every few seconds, some elements within element with 'contain:strict' are modified. If layout is forced after each modification, then the subtree-layout is called for given element. However, if layout is forced after a bunch of modifications, the fallback to full-screen layout happens (see https://github.com/WebKit/WebKit/blob/6a650e644b1ccf02a2aa19f07d5ec4bc706ac8ce/Source/WebCore/page/LocalFrameViewLayoutContext.cpp#L465).

This is probably a bug as in latter case the layout should happen just only for the subtrees.

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