Copy across the specified properties of each dataset when updating the chart

lib/core.js

@@ -59,10 +59,18 @@ module.exports = {
       chart.data.labels = [];
 
       // Adds the datapoints from nextProps
+      var propsToCopy = ['hidden'];
+
       nextProps.data.datasets.forEach(function(set, setIndex) {
         set.data.forEach(function(val, pointIndex) {
           chart.data.datasets[setIndex].data[pointIndex] = nextProps.data.datasets[setIndex].data[pointIndex];
         });
+
+        propsToCopy.forEach(function(prop) {
+            if (nextProps.data.datasets[setIndex][prop] !== undefined) {
+                chart.data.datasets[setIndex][prop] = nextProps.data.datasets[setIndex][prop];
+            }
+        });
       });
 
       // Sets the labels from nextProps
@@ -118,4 +126,4 @@ module.exports = {
 
     return React.createClass(classData);
   }
-};
+};