handle transforms in Plotly.react - by looking at _fullInput

Author: alexcjohnson

src/plot_api/plot_api.js

@@ -2421,6 +2421,13 @@ function getDiffFlags(oldContainer, newContainer, outerparts, opts) {
         return valObject.valType === 'data_array' || valObject.arrayOk;
     }
 
+    // for transforms: look at _fullInput rather than the transform result, which often
+    // contains generated arrays.
+    var newFullInput = newContainer._fullInput;
+    var oldFullInput = oldContainer._fullInput;
+    if(newFullInput && newFullInput !== newContainer) newContainer = newFullInput;
+    if(oldFullInput && oldFullInput !== oldContainer) oldContainer = oldFullInput;
+
     for(key in oldContainer) {
         // short-circuit based on previous calls or previous keys that already maximized the pathway
         if(flags.calc) return;