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I noticed that org-babel-result-to-file never expands file: links in
src block results when ran from indirect buffer and default-directory
is not same with base buffer file's directory. This is against the
docstring stating that

> If the `default-directory' is different from the containing
> file's directory then expand relative links.

The misbehavior happens because buffer-file-name variable is always
nil in indirect buffers. We need to call (file-name-directory
(buffer-file-name (buffer-base-buffer))) instead.

The patch is attached.

Best,
Ihor