#30a PR feedback: commenting and removing disused binding

Author: monfera

src/components/modebar/buttons.js

@@ -350,6 +350,8 @@ function handleCamera3d(gd, ev) {
 
         if(attr === 'resetDefault') scene.setCameraToDefault();
         else if(attr === 'resetLastSave') {
+            // This handler looks in the un-updated fullLayout.scene.camera object to reset the camera
+            // to the last saved position.
             scene.setCamera(fullSceneLayout.camera);
         }
     }

test/jasmine/tests/gl_plot_interact_test.js

@@ -214,14 +214,13 @@ describe('Test gl plot interactions', function() {
     describe('gl3d plots', function() {
 
         var mock = require('@mocks/gl3d_scatter3d-connectgaps.json'),
-            modeBar, relayoutCallback;
+            relayoutCallback;
 
         beforeEach(function(done) {
             gd = createGraphDiv();
 
             Plotly.plot(gd, mock.data, mock.layout).then(function() {
 
-                modeBar = gd._fullLayout._modeBar;
                 relayoutCallback = jasmine.createSpy('relayoutCallback');
 
                 gd.on('plotly_relayout', relayoutCallback);