is the function FileUtils::getInstance()->isFileExist don;t check sub dirs in Coco2dx 3.0 RC1

at CC_PLATFORM_WIN32
I put a a.ttf file into Resources\fonts

then use Label::createWithTTF(TTFConfig(“a.ttf”, 40),“abcd” ) to create a lable
the lable doesn’t use a.ttf because of
FileUtils::getInstance()->isFileExist(ttfConfig.fontFilePath)
return false
isFileExist only check files in ‘Resources’ not check ‘Resources\fonts’

We fixed it at https://github.com/cocos2d/cocos2d-x/pull/6110.