Disregard GDK's extra click events that are for double-clicks and triple-clicks. Based on Chris Blizzard's GTK2-port patch. r+sr=blizzard b=227328

widget/src/gtk/nsWidget.cpp

@@ -1834,6 +1834,21 @@ nsWidget::OnButtonPressSignal(GdkEventButton * aGdkButtonEvent)
   nsMouseScrollEvent scrollEvent;
   PRUint32 eventType = 0;
 
+  // If you double click in GDK, it will actually generate a single
+  // click event before sending the double click event, and this is
+  // different than the DOM spec.  GDK puts this in the queue
+  // programatically, so it's safe to assume that if there's a
+  // double click in the queue, it was generated so we can just drop
+  // this click.
+  GdkEvent *peekedEvent = gdk_event_peek();
+  if (peekedEvent) {
+    GdkEventType type = peekedEvent->any.type;
+    gdk_event_free(peekedEvent);
+    if (type == GDK_2BUTTON_PRESS || type == GDK_3BUTTON_PRESS)
+      return;
+  }
+
+
   // Switch on single, double, triple click.
   switch (aGdkButtonEvent->type) 
   {