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Hi Alexander,

first thanks for not insisting in closing the bug.
Let me try to explain why I believe that the change you 
have described does not solve the question.

Here is a case where things go wrong:
Let us assume your site default is cp1251, so you want
to write in cyrillic.

You get one (a) text/plain attachment which is cyrillic
with charset utf-8 and another one (b) which is cyrillic
with charset cp1251. 

Now they both get send out with nosy, both probably cannot
be "mail-encoded" with 7-bit and with your fix will most
likely get encoded as quoted-printable.
But if you do not save the charset you probably will send
out a) with a charset of cd1251 which will break the text.
This is why I think the bug is not fully solved.
I have tried to change the subject to better reflect this.
What do you think?

So we must save the charset to have a real fix.
My patch was a dirty workaround which fixed the problem
in an expensive way, but at one place.
If you replace "latin-1" with the EMAIL charset default,
it would be an even better kludge.

But of course a better solution should be implemented.