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

[Stefan Monnier]

>> Most likely we need to do something in the rmail code that calls
>> buffer-swap-text.

> Not sure what you had in mind.  buffer-swap-text is not called
> (AFAICS) between "C-x C-s" and the return to top-level.  So how can
> anything we do in rmail-swap-buffers help here?

Oh, I see, it's because setting coding-system-for-write affect the
buffer-file-coding-system choice which is later saved into the
"original" buffer, which in this case is the displayed buffer.

Hmm...

Let's take a step back: when/why does buffer-file-coding-system matter
in the RMAIL display buffer?


        Stefan