[RSS Feed/News] Assets are not copied from style archive when using symlinks

[XenForo]

If the path to the temporary directory does contain a symlink somewhere, copying files from a style archive does fail due to
PHP:

$stdPath = File::stripRootPathPrefix($pathname, $tempDir);

if (!$this->isWithinAssetPath($stdPath, $assetPaths))
{
    continue;
}

As $tempDir does not contain the realpath, calling stripRootPathPrefix does nothing and thus isWithinAssetPath returns false which skips the file.

Suggested Solution
Call realpath before returing...

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