[Webkit-unassigned] [Bug 139914] New: [Mac] Cannot scroll when a non-scrollable iframe is contained inside a scrollable iframe

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139914

            Bug ID: 139914
           Summary: [Mac] Cannot scroll when a non-scrollable iframe is
                    contained inside a scrollable iframe
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Macintosh
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

Simon and Jessie discovered a problem with scrolling when a non-scrollable iframe is nested inside a scrollable one. We latch to the non-scrollable frame and don't recognize that we need to relay scroll events to the parent.

As Simon wrote to me:
"The latching logic is broken for a non-scrollable iframe inside a scrollable iframe. It happens to work for a non-scrollable iframe in the main frame because, after EventHandler::platformCompleteWheelEvent() does latchingState->setFrame(nullptr), the mainframe's view then gets returned from frameViewForLatchingState() on the next event."

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