Fixed issue with pressed enter key with IME.

keyup and keypress don't care IME on or off.  so, I added handling
keydown event to check pressing enter key with IME (keycode is 229) or
without IME (keycode is 13).

core/field_textinput.js

@@ -132,7 +132,10 @@ Blockly.FieldTextInput.prototype.showEditor_ = function(opt_quietInput) {
     htmlInput.select();
   }
 
-  // Bind to keyup -- trap Enter and Esc; resize after every keystroke.
+  // Bind to keydown -- trap Enter without IME and Esc to hide.
+  htmlInput.onKeyDownWrapper_ =
+      Blockly.bindEvent_(htmlInput, 'keydown', this, this.onHtmlInputKeyDown_);
+  // Bind to keyup -- trap Enter; resize after every keystroke.
   htmlInput.onKeyUpWrapper_ =
       Blockly.bindEvent_(htmlInput, 'keyup', this, this.onHtmlInputChange_);
   // Bind to keyPress -- repeatedly resize when holding down a key.
@@ -145,20 +148,30 @@ Blockly.FieldTextInput.prototype.showEditor_ = function(opt_quietInput) {
 };
 
 /**
- * Handle a change to the editor.
+ * Handle key down to the editor.
  * @param {!Event} e Keyboard event.
  * @private
  */
-Blockly.FieldTextInput.prototype.onHtmlInputChange_ = function(e) {
+Blockly.FieldTextInput.prototype.onHtmlInputKeyDown_ = function(e) {
   var htmlInput = Blockly.FieldTextInput.htmlInput_;
-  if (e.keyCode == 13) {
-    // Enter
+  var enterKey = 13, escKey = 27;
+  if (e.keyCode == enterKey) {
     Blockly.WidgetDiv.hide();
-  } else if (e.keyCode == 27) {
-    // Esc
+  } else if (e.keyCode == escKey) {
     this.setText(htmlInput.defaultValue);
     Blockly.WidgetDiv.hide();
-  } else {
+  }
+};
+
+/**
+ * Handle a change to the editor.
+ * @param {!Event} e Keyboard event.
+ * @private
+ */
+Blockly.FieldTextInput.prototype.onHtmlInputChange_ = function(e) {
+  var htmlInput = Blockly.FieldTextInput.htmlInput_;
+  var escKey = 27;
+  if (e.keyCode != escKey) {
     // Update source block.
     var text = htmlInput.value;
     if (text !== htmlInput.oldValue_) {
@@ -238,6 +251,7 @@ Blockly.FieldTextInput.prototype.widgetDispose_ = function() {
     }
     thisField.setText(text);
     thisField.sourceBlock_.rendered && thisField.sourceBlock_.render();
+    Blockly.unbindEvent_(htmlInput.onKeyDownWrapper_);
     Blockly.unbindEvent_(htmlInput.onKeyUpWrapper_);
     Blockly.unbindEvent_(htmlInput.onKeyPressWrapper_);
     Blockly.unbindEvent_(htmlInput.onWorkspaceChangeWrapper_);