code: function _addExplicitLayerEvent($canvas, data, layer, eventName) {
  	_addLayerEvent($canvas, data, layer, eventName);
  	if (eventName === 'mouseover' || eventName === 'mouseout' || eventName === 'mousemove') {
  		data.redrawOnMousemove = true;
  	}
  }
docs: Add a layer event that was explicitly declared in the layer's parameter map, excluding events added implicitly (e.g. mousemove event required by draggable layers)