Remove selection in Block Factory when switching modes.

core/block.js

@@ -903,8 +903,6 @@ Blockly.Block.prototype.appendDummyInput = function(opt_name) {
  */
 Blockly.Block.prototype.jsonInit = function(json) {
   // Validate inputs.
-  goog.asserts.assertString(json['message0'], 'No message.');
-  goog.asserts.assertArray(json['args0'], 'No args.');
   goog.asserts.assert(json['output'] == undefined ||
       json['previousStatement'] == undefined,
       'Must not have both an output and a previousStatement.');

core/blockly.js

@@ -464,26 +464,6 @@ Blockly.hideChaff = function(opt_allowToolbox) {
   }
 };
 
-/**
- * Deselect any selections on the webpage.
- * Chrome will select text outside the SVG when double-clicking.
- * Deselect this text, so that it doesn't mess up any subsequent drag.
- */
-Blockly.removeAllRanges = function() {
-  if (getSelection()) {
-    setTimeout(function() {
-        try {
-          var selection = getSelection();
-          if (!selection.isCollapsed) {
-            selection.removeAllRanges();
-          }
-        } catch (e) {
-          // MSIE throws 'error 800a025e' here.
-        }
-      }, 0);
-  }
-};
-
 /**
  * Return an object with all the metrics required to size scrollbars for the
  * main workspace.  The following properties are computed:

core/utils.js

@@ -325,6 +325,26 @@ Blockly.createSvgElement = function(name, attrs, opt_parent) {
   return e;
 };
 
+/**
+ * Deselect any selections on the webpage.
+ * Chrome will select text outside the SVG when double-clicking.
+ * Deselect this text, so that it doesn't mess up any subsequent drag.
+ */
+Blockly.removeAllRanges = function() {
+  if (getSelection()) {
+    setTimeout(function() {
+        try {
+          var selection = getSelection();
+          if (!selection.isCollapsed) {
+            selection.removeAllRanges();
+          }
+        } catch (e) {
+          // MSIE throws 'error 800a025e' here.
+        }
+      }, 0);
+  }
+};
+
 /**
  * Is this event a right-click?
  * @param {!Event} e Mouse event.

demos/blockfactory/factory.js

@@ -62,6 +62,7 @@ function onchange() {
  * Update the language code.
  */
 function updateLanguage() {
+  Blockly.removeAllRanges();
   var code = [];
   var rootBlock = getRootBlock();
   if (rootBlock) {
@@ -495,6 +496,7 @@ function getTypesFrom_(block, name) {
  * Update the generator code.
  */
 function updateGenerator() {
+  Blockly.removeAllRanges();
   function makeVar(root, name) {
     name = name.toLowerCase().replace(/\W/g, '_');
     return '  var ' + root + '_' + name;