pass context mapbox access token during cloneplot

- so that toImage works when token is set in config
  argument.

Author: etpinard

src/snapshot/cloneplot.js

@@ -70,6 +70,7 @@ module.exports = function clonePlot(graphObj, options) {
     var oldLayout = graphObj.layout;
     var newData = extendDeep([], oldData);
     var newLayout = extendDeep({}, oldLayout, cloneLayoutOverride(options.tileClass));
+    var context = graphObj._context || {};
 
     if(options.width) newLayout.width = options.width;
     if(options.height) newLayout.height = options.height;
@@ -153,7 +154,8 @@ module.exports = function clonePlot(graphObj, options) {
                 options.plotGlPixelRatio,
             displaylogo: options.displaylogo || false,
             showLink: options.showLink || false,
-            showTips: options.showTips || false
+            showTips: options.showTips || false,
+            mapboxAccessToken: context.mapboxAccessToken
         }
     };
 

test/jasmine/tests/snapshot_test.js

@@ -80,7 +80,8 @@ describe('Plotly.Snapshot', function() {
                 displaylogo: false,
                 showLink: false,
                 showTips: false,
-                setBackground: 'opaque'
+                setBackground: 'opaque',
+                mapboxAccessToken: undefined
             };
 
             var themeTile = Plotly.Snapshot.clone(dummyGraphObj, themeOptions);