Fix number block displaying non-number values (#2073)

appinventor/blocklyeditor/ploverConfig.js

@@ -143,6 +143,7 @@
     "./src/language_switch.js",
     "./src/warning.js",
     "./src/toolboxController.js",
+    "./src/field.js",
 
     // Dialog Utiltiy
     "./src/util.js",

appinventor/blocklyeditor/src/field.js

+// -*- mode: java; c-basic-offset: 2; -*-
+// Copyright © 2016 Massachusetts Institute of Technology. All rights reserved.
+
+/**
+ * @license
+ * @fileoverview Visual blocks editor for MIT App Inventor
+ * Add additional "class methods" to Blockly.Field
+ */
+
+'use strict';
+
+goog.provide('AI.Blockly.Field');
+
+goog.require('Blockly.Field');
+
+
+/**
+ * Sets the value of the field. Since AI runs an older version of blockly,
+ * the newValue should always be a string.
+ *
+ * This is overridden so that the field correctly updates the display text
+ * even if the newValue is the same as the old value.
+ * @param {string} newValue The new value.
+ */
+Blockly.Field.prototype.setValue = function(newValue) {
+  if (newValue === null) {
+    return null;  // No change if null;
+  }
+  var oldValue = this.getValue();  // Must get value before setting text.
+  this.setText(newValue);  // Always update text. See #1238.
+  if (this.sourceBlock_ && Blockly.Events.isEnabled() && newValue != oldValue) {
+    Blockly.Events.fire(new Blockly.Events.Change(
+        this.sourceBlock_, 'field', this.name, oldValue, newValue));
+  }
+};