title: Disable ag-grid when showing loading- or any overlay
body: <p>When showing the loading overlay (or any other overlay) by using the api call </p>
  
  <p><code>gridOptions.api.showLoadingOverlay()</code> </p>
  
  <p>in ag-grid, the rows and all grid-functions (buttons, context-menu, etc.) below the overlay are still selectable/usable. </p>
  
  <p>Is there any way that I can prevent that from happening? Are there any plans to change this behaviour in a future release?</p>