[Webkit-unassigned] [Bug 183081] New: Relayout frames after AsyncFrameScrolling option is changed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=183081

            Bug ID: 183081
           Summary: Relayout frames after AsyncFrameScrolling option is
                    changed
           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
        Depends on: 173704
            Blocks: 149264, 171667

Created attachment 334524

  --> https://bugs.webkit.org/attachment.cgi?id=334524&action=review

Patch (WIP)

Changing AsyncFrameScrolling may change frame flattening after bug 173704 and hence may require a relayout. 
Maybe we also need to update scrolling tree and related stuff when enabling/disabling async frame scrolling.

Note that disabling AsyncFrameScrolling via the iOS UI does not take effect immediately, because of bug 182485.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=149264
[Bug 149264] IFrame scrolling=yes is ignored in iOS Safari
https://bugs.webkit.org/show_bug.cgi?id=171667
[Bug 171667] [Mac] Make frames fast-scrollable
https://bugs.webkit.org/show_bug.cgi?id=173704
[Bug 173704] [iOS] Do not flatten frames when async frame scrolling is enabled
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