Interpret the filename as a file relative to the given file - unless the filename already represents an absolute filename.
@param file the "reference" file for relative paths. Thisinstance must be an absolute file and must not contain "./" or "../" sequences (same for \ instead of /). If it is null, this call is equivalent to new java.io.File(filename).
@param filename a file name
@return an absolute file that doesn't contain "./" or"../" sequences and uses the correct separator for the current platform.
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