title: FullCalendar refresh interferes with the user's new selection
body: <p>I have already found [this answer][1], but I can't detect when the user start dragging for a new selection.</p>
  
  <p>I need to refresh FullCalendar every 30 seconds, but without interfering with the user's activity.</p>
  
  <p>Currently I have a bool in eventDragStart, eventDragStop, eventResizeStart, eventResizeStop events, but I can't find any event related to when the user start dragging in a blank area of the agenda view.
  (In my calendar I have selectable: true, the user can create new events simply dragging in a blank area of the agenda view).</p>
  
  <p>Any help is welcome! Thanks!</p>