Hi,

When using LINES in `org-export--prepare-file-contents' the footnotes
section is not preserved causing export to fail.

Minimal example

$> cat t{1,2}.org
# this is t1.org
* intro
foo[fn:1]
* sec2
bar
* Footnotes

[fn:1] baz


# this is t2.org
#+INCLUDE: "./t1.org::#intro"

And export t2.org.

The attached patch fixes this by explicitly saving the footnote section

(Aside: org-footnote-section is used in hackish ways; should we make a
function that returns to correct regexp for the footnotes section?).

It works in a rather large document of mine and in the minimal test.

Should I apply it, or is there a better way to fix this bug?

Thanks,
Rasmus

-- 
Slowly unravels in a ball of yarn and the devil collects it