* in the 'fake_drag' case (dragging the playhead from the ruler), the mouse events are delivered to the playhead during the drag so we need to temporarily sensitize the playhead during that operation, then reset the sensitivity via config
* in the 'fake_drag' case (dragging the playhead from the ruler), the mouse events are delivered to the playhead during the drag so we need to temporarily sensitize the playhead during that operation, then reset the sensitivity via config