Fix renaming

core/block.js

@@ -724,6 +724,24 @@ Blockly.Block.prototype.renameVar = function(oldName, newName) {
   }
 };
 
+/**
+ * Notification that a variable is renaming.
+ * If the name matches one of this block's variables, rename it.
+ * @param {string} oldId ID of variable to rename.
+ * @param {string} newId ID of new variable.  May be the same as oldId, but with
+ *     an updated name.
+ */
+Blockly.Block.prototype.renameVarById = function(oldId, newId) {
+  for (var i = 0, input; input = this.inputList[i]; i++) {
+    for (var j = 0, field; field = input.fieldRow[j]; j++) {
+      if (field instanceof Blockly.FieldVariable &&
+          oldId == field.getValue()) {
+        field.setValue(newId);
+      }
+    }
+  }
+};
+
 /**
  * Returns the language-neutral value from the field of a block.
  * @param {string} name The name of the field.