Fix for Win32 part of bug 321098: onmouseover alert() causing multiple stacked alert dialogs

r+sr=roc

widget/src/windows/nsWindow.cpp

@@ -6064,8 +6064,6 @@ PRBool nsWindow::DispatchMouseEvent(PRUint32 aEventType, WPARAM wParam, LPARAM l
 
   // call the event callback
   if (nsnull != mEventCallback) {
-    result = DispatchWindowEvent(&event);
-
     if (aEventType == NS_MOUSE_MOVE) {
       MouseTrailer::GetSingleton().Disable();
       if (!mIsInMouseCapture) {
@@ -6096,6 +6094,8 @@ PRBool nsWindow::DispatchMouseEvent(PRUint32 aEventType, WPARAM wParam, LPARAM l
       }
     }
 
+    result = DispatchWindowEvent(&event);
+
     // Release the widget with NS_IF_RELEASE() just in case
     // the context menu key code in nsEventListenerManager::HandleEvent()
     // released it already.