faster dragNodes plugins

2 x refresh was not necessary because invoked by executeNodeMouseMove

(possible pull request)

tinawebJS/sigma_v1.2/plugins/sigma.plugins.dragNodes/sigma.plugins.dragNodes.js

@@ -170,7 +170,7 @@
 
         // Deactivate drag graph.
         _renderer.settings({mouseEnabled: false, enableHovering: false});
-        _s.refresh();
+        // _s.refresh();
 
         _self.dispatchEvent('startdrag', {
           node: _node,
@@ -198,7 +198,7 @@
 
       // Activate drag graph.
       _renderer.settings({mouseEnabled: true, enableHovering: true});
-      _s.refresh();
+      // _s.refresh();
 
       if (_drag) {
         _self.dispatchEvent('drop', {