bug#4623: 23.1.50; rmail changes encoding of characters on save

[Eli Zaretskii]

> From: Markus Rost <rost@math.uni-bielefeld.de>
> CC: monnier@iro.umontreal.ca, 4623@emacsbugs.donarmstrong.com
> Date: Sat,  5 Dec 2009 21:10:56 +0100 (CET)
> 
> > Btw, I find rmail-swap-buffers incomplete in its handling of encoding
> > and the modified flag.  It looks like it works by sheer luck, unless
> > I'm missing something.  I suggest the following more thorough version.
> 
> I feel like running in circles.

Nah, it just means good ideas never die, they just get reborn ;-)

> What about the patch below?

I think it goes a tad too far.  What I had in mind was way simpler:
record the encoding of the current message inside rmail-show-message,
then restore it in after-save-hook.

Stefan, I surely would like to hear from you on this one, the 23.2
release branch being so close.