[Webkit-unassigned] [Bug 82960] New: [Qt][WK2] Seg fault when property binding to experimental.contentY

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=82960

           Summary: [Qt][WK2] Seg fault when property binding to
                    experimental.contentY
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rafael.lobo at openbossa.org


It's easy to reproduce with MiniBrowser code. On BrowserWindow.qml, do the following:

     WebView {
         id: webView
+        property bool scrolledUpToBoundary: webView.experimental.contentY < 0
+        onScrolledUpToBoundaryChanged: console.log('Scrolled up?' + scrolledUpToBoundary)

It is expected that we can lookup to contentY changes and properly bind the properties here. The comparison webView.experimental.contentY < 0 is causing the seg fault. If instead of this you only work inside experimental.onContentYChanged and print the new value, it works. So you can just force updates to "scrollUpToBoundary" this way inside experimental, but I believe we should be able to do the other way around. Here's an example of the workaround:

+        property bool scrolledUpToBoundary: false
+        experimental {
+            onContentYChanged: webView.scrolledUpToBoundary = webView.experimental.contentY < 0
+        }

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