[O] [ox-beamer] Frame subtitles are not handled anymore

[Sebastien Vauban]

Hello Nicolas,

It took me quite some time, but I'm at the end of converting a 90 slides
presentation from the old to the new exporter.

In that presentation, there is (just!) one thing which does not work anymore:
the frame subtitles.

Before, I could write:

--8<---------------cut here---------------start------------->8---
* News \\ Technology

...
--8<---------------cut here---------------end--------------->8---

and get that exported as:

--8<---------------cut here---------------start------------->8---
\begin{frame}
  \frametitle{News}
  \framesubtitle{Technology}
  ...
\end{frame}
--8<---------------cut here---------------end--------------->8---

(or similar.)

Now, such a title is simply cut over 2 lines; hence, the use of a bad font (in
LaTeX) for the subtitle (font as big as the one customized for the title
itself).

How could we write subtitles again in Beamer presentations?

Best regards,
  Seb

-- 
Sebastien Vauban