service timers so they do not infinitely re-trigger

src/gui/jtk/Jtk_event.cc

@@ -241,6 +241,7 @@ void Jtk_WaitEvent(Jtk_Event * event)
         {
             event->type = JTK_EVENT_TIMER;
             event->timer.timer_id = timer_id;
+            Jtk_ServiceTimer(timer_id);
             return;
         }