[Webkit-unassigned] [Bug 33931] New: pushstate() from within a popstate handler might lead to improper scroll/view state being incorrect later

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=33931

           Summary: pushstate() from within a popstate handler might lead
                    to improper scroll/view state being incorrect later
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: beidson at apple.com


pushstate() from within a popstate handler might lead to improper scroll/view
state being incorrect later

See the test case in https://bugs.webkit.org/show_bug.cgi?id=33830 for
reference.

Since the popstate event - fired from within FrameLoader::loadInSameDocument()
called from FrameLoader::navigateWithinDocument() - can effectively change the
current history item, the later call to
history()->restoreScrollPositionAndViewState() will be operating on the wrong
"current history item" from the perspective of the load.

There's a lot of complexity here in getting this precisely right, especially
since popstate events might nest and we'd probably only want to restore the
scroll/view state from the most recently popped item.

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