[Webkit-unassigned] [Bug 105366] New: CSS Regions webkitregionlayoutupdate is triggered for all flows even though only one flow has to be updated

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=105366

           Summary: CSS Regions webkitregionlayoutupdate is triggered for
                    all flows even though only one flow has to be updated
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: johannes.wilm at sourcefabric.org
                CC: keishi at webkit.org, pmuellr at yahoo.com,
                    pfeldman at chromium.org, yurys at chromium.org,
                    apavlov at chromium.org, loislo at chromium.org,
                    vsevik at chromium.org, mibalan at adobe.com,
                    web-inspector-bugs at googlegroups.com


If any change to any region is done (using contenteditable=true), a webkitregionlayoutupdate event is triggered for all flows, no matter whether anything was actually changed in any of the regions belonging to other flows than the one that was just edited. 

I have attached a self-explanatory test file

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