Support renderValue within iframe

Author: Jeffrey Shen

inst/htmlwidgets/plotly.js

@@ -155,6 +155,10 @@ HTMLWidgets.widget({
       x.config.modeBarButtonsToRemove.push("sendDataToCloud");
     }
 
+    // if the object was passed in from another window, plotly will falsely think it isn't a "plain object"
+    if (inIframe())
+      Object.setPrototypeOf(x, Object.prototype);
+
     // if no plot exists yet, create one with a particular configuration
     if (!instance.plotly) {
 
@@ -832,6 +836,10 @@ function isPlainObject(obj) {
   );
 }
 
+function inIframe() {
+  return window && window.self !== window.top;
+}
+
 function subsetArrayAttrs(obj, indices) {
   var newObj = {};
   Object.keys(obj).forEach(function(k) {