Bug 513684. Stop :hover from bleeding through certain elements. r=roc Test fixes from Markus Stange <mstange@themasta.com>.

layout/base/nsPresShell.cpp

@@ -4438,9 +4438,9 @@ PresShell::DispatchSynthMouseMove(nsGUIEvent *aEvent,
 {
   PRUint32 hoverGenerationBefore = mFrameConstructor->GetHoverGeneration();
   nsEventStatus status;
-  nsIView* rootView;
-  mViewManager->GetRootView(rootView);
-  mViewManager->DispatchEvent(aEvent, rootView, &status);
+  nsIView* targetView;
+  targetView = nsIView::GetViewFor(aEvent->widget);
+  mViewManager->DispatchEvent(aEvent, targetView, &status);
   if (aFlushOnHoverChange &&
       hoverGenerationBefore != mFrameConstructor->GetHoverGeneration()) {
     // Flush so that the resulting reflow happens now so that our caller

widget/tests/native_mouse_mac_window.xul

@@ -434,13 +434,8 @@
         [387, 170, NSMouseMoved, null, right, [
           { type: "mouseover", target: panel },
           { type: "mousemove", target: panel },
-          { type: "mouseout", target: panel, todoShouldNotHaveFired: true },
-          { type: "mouseover", target: left.document.documentElement, todoShouldNotHaveFired: true },
         ]],
-        // Why does left.document.documentElement get entered? This makes no sense. 
         [387, 171, NSMouseMoved, null, left, [
-          { type: "mouseout", target: left.document.documentElement, todoShouldNotHaveFired: true },
-          { type: "mouseover", target: panel, todoShouldNotHaveFired: true },
           { type: "mousemove", target: panel },
         ]],
         [388, 171, NSMouseMoved, panel, left, [