Export does not include all categories (maybe found a fix)

I am using about 530 categories in a test project, and the standard wordpress export did not include all of them.

I found this line in export.php, in function wxr_missing_parents

$passes = 2000 + count( $categories );

and modified it to:

$passes = 6 * (count( $categories ));

…and so far so good. – No idea what it means, but it seems to have done the trick! Thought I should tell someone? :s

P.S. I realise that’s an unusually large number of categories, hence it being merely a test project so far 😉