Greg Minshall writes:
> - the next time i open the Org Src buffer, whatever lint-like process is
>    running for that language may complain about extra spaces at the end
>    of a line.  (does that mean my experience is different from yours, or
>    at least from your expectation?)
If I try your original examples with `emacs -q' I do not get extra 
whitespace in
the org src buffer. Those two spaces in the original org buffer -- that 
are due
to `org-edit-src-content-indentation' -- are removed in the org src 
buffer. If
you do not find it to be the case, then I'm missing something.

Anyway, here's a patch that cleans up blank lines, except the current 
one. It
preserves the fix for the original issue.

Can you try it out ?

Regards,

-- 
Sébastien Miquel