TextField input error in cocos2dx 3.0 beta 2

Now TextField widget can’t support Chinese character input, I looked through the src code found that TextFieldTTF::insertText()
{
std::string insert(text, len);
}
will cut a unicode char into 1/2, and LabelTTF::setString() seems doesn’t like Label::setString() that handle unicode chars well,pls fix it,thx!