Revert "Do not render in handleDownEvent"

src/ol/interaction/dragrotateandzoominteraction.js

@@ -88,6 +88,7 @@ ol.interaction.DragRotateAndZoom.handleDragEvent_ = function(mapBrowserEvent) {
   var theta = Math.atan2(delta.y, delta.x);
   var magnitude = delta.magnitude();
   var view = map.getView();
+  map.render();
   if (this.lastAngle_ !== undefined) {
     var angleDelta = theta - this.lastAngle_;
     ol.interaction.Interaction.rotateWithoutConstraints(