getPathForFilename broken on Android with multi-resolution

Hi!
getPathForFilename can’t find any file in directories added with CCFileUtils::addSearchResolutionsOrder when using multi-resolution. I use cocos2d-x 2.2.1.

My code to add a resolution order for high-definition (hd folder)

fileUtils.addSearchResolutionsOrder("hd");
pDirector->setContentScaleFactor(2.f);

Then I load the file (in Lua)

CCSpriteFrameCache:sharedSpriteFrameCache():addSpriteFramesWithFile('actions.plist')

I made some debug and could find out that the resolution order (hd) is concatenated to the filename (actions.plist) without any slash in between. Check line 3 in the log output below.

D/cocos2d-x debug info(24600): SEARCHING: actions.plist, hd, assets/
D/cocos2d-x debug info(24600): path= assets/hd file= actions.plist
D/cocos2d-x debug info(24600): File assets/hdactions.plist not found

The bug is fixed if I use getFullPathForDirectoryAndFilename from cocos2d-x 3.0 which include the required slash.

std::string CCFileUtils::getFullPathForDirectoryAndFilename(const std::string& strDirectory, const std::string& strFilename)
{
    std::string ret = strDirectory;
    if (strDirectory.size() && strDirectory[strDirectory.size()-1] != '/'){
        ret += '/';
    }
    ret += strFilename;
    // if the file doesn't exist, return an empty string
    if (!isFileExist(ret)) {
        ret = "";
    }
    return ret;

Is there any issue using a hardcoded slash separator on other platform (i.e. windows)?

Thanks!