富文本显示英文字符串时，有呑字现象

[mengxuanr]

1.富文本控件参数的设置：
1）允许使用UBB语法
2）默认设置的大小是，w->900,h->136
3）自动大小方式是适配高度
4）字体大小48，字体使用苹方粗体ttf字体库

2.测试字符串“They[color=#d94e29] stole[/color] all my money! “the woman screamed.

3.测试结果现象

4.使用的引擎是coco2dx 3.17，使用xcode在debug模式下查看在下面方法内
void FUIRichText::handleTextRenderer(FUIRichElement* element, const TextFormat& format, const std::string& text)
{
FUILabel* textRenderer = FUILabel::create();
textRenderer->setCascadeOpacityEnabled(true);
textRenderer->getTextFormat()->setFormat(format);
textRenderer->applyTextFormat();
textRenderer->setString(text);
textRenderer->setUserData(element);

float textRendererWidth = textRenderer->getContentSize().width;
_leftSpaceWidth -= textRendererWidth;
if (_leftSpaceWidth >= 0)
{
    _elementRenders.back().push_back(textRenderer);
    return;
}

int leftLength = findSplitPositionForWord(textRenderer, text);

//The minimum cut length is 1, otherwise will cause the infinite loop.
if (0 == leftLength) leftLength = 1;

//测试下面这条语句leftWords显示的是 " all my money! “the w"，但不知道怎么修改
std::string leftWords = getSubStringOfUTF8String(text, 0, leftLength);
int rightStart = leftLength;
if (std::isspace(text[rightStart], std::locale()))
rightStart++;
std::string cutWords = getSubStringOfUTF8String(text, rightStart, text.length() - leftLength);
if (leftLength > 0)
{
FUILabel* leftRenderer = FUILabel::create();
leftRenderer->setCascadeOpacityEnabled(true);
leftRenderer->getTextFormat()->setFormat(format);
leftRenderer->applyTextFormat();
leftRenderer->setString(getSubStringOfUTF8String(leftWords, 0, leftLength));
leftRenderer->setUserData(element);
_elementRenders.back().push_back(leftRenderer);
}

if (cutWords.length() > 0)
{
    addNewLine();
    handleTextRenderer(element, format, cutWords);
}

}