[Webkit-unassigned] [Bug 133975] New: Change of -webkit-overflow-scrolling causes a layout regardless of whether a stacking context was removed or added

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=133975

           Summary: Change of -webkit-overflow-scrolling causes a layout
                    regardless of whether a stacking context was removed
                    or added
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: nick.maynard at alumni.doc.ic.ac.uk


This bug: 
https://bugs.webkit.org/show_bug.cgi?id=120535

Adds a changeset to ensure that a layout is performed when the value of -webkit-overflow-scrolling changes, down to the creation/destruction of a stacking context.

In situations where the element has a stacking context for another reason (-webkit-transform, for example), there will already be a stacking context on the element.  Consequently, a change to -webkit-overflow-scrolling will have no effect on the existence of a stacking context.

In these cases, we see a visible flicker when the (unnecessary) layout is performed.

Perhaps a check to see if a layout is required based on the consequent creation/destruction of a stacking context would be more appropriate.

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