code: function onPointerMoveCaptured( tracker, event ) {
          var pointsList = tracker.getActivePointersListByType( getPointerType( event ) );
          if ( pointsList.getById( event.pointerId ) ) {
              handlePointerMove( tracker, event );
          }
          $.stopEvent( event );
      }
docs: This handler is attached to the window object (on the capture phase) to emulate mouse capture.
  onPointerMove is still attached to the tracked element, so stop propagation to avoid processing twice.
  
  @private
  @inner