fixed #974, requesting a redraw on update in case of physics being disabled.

lib/network/Network.js

@@ -264,7 +264,7 @@ Network.prototype.bindEventListeners = function () {
     // update shortcut lists
     this._updateVisibleIndices();
     this.physics.updatePhysicsData();
-
+    this.body.emitter.emit("_requestRedraw");
     // call the dataUpdated event because the only difference between the two is the updating of the indices
     this.body.emitter.emit("_dataUpdated");
   });
@@ -276,6 +276,7 @@ Network.prototype.bindEventListeners = function () {
     this._updateValueRange(this.body.edges);
     // start simulation (can be called safely, even if already running)
     this.body.emitter.emit("startSimulation");
+    this.body.emitter.emit("_requestRedraw");
   });
 };