Propagate button press event explicitly from the view

Apparently the button events tend to be stuck and not properly
propagated, so we resort to emitting the signal ourselves.

extensions/mouse-gestures/main.c

@@ -44,7 +44,7 @@ static gboolean mouse_gestures_handle_events (GtkWidget     *widget,
                                               MidoriBrowser *browser)
 {
     /* A button was pressed */
-    if (event->type == GDK_BUTTON_PRESS)
+    if (event->type == GDK_BUTTON_PRESS && event->button.button == 2)
     {
         /* If the gesture was previously cleaned, start a new gesture and coordinates */
         if (gesture->last == MOUSE_BUTTON_UNSET)

midori/midori-view.c

@@ -1016,6 +1016,9 @@ gtk_widget_button_press_event_cb (WebKitWebView*  web_view,
         return TRUE;
     }
 
+    /* We propagate the event, since it may otherwise be stuck in WebKit */
+    g_signal_emit_by_name (view, "event", event, &background);
+
     return FALSE;
 }