bug#81606: Mojibake with UTF-8 file names

>>   Non-ASCII characters in the name of of the master file must use
>>   the same encoding as the current input file itself.  To make this
>>   actually work, set the @code{coding} local variable accordingly;
>>   in most cases, you want to use UTF-8 encoding.  Example:
> 
> This doesn't work, I think: the encoding of the current file is not
> known when latexenc looks for the name of the main file.  That was
> the reason for the original problem in this bug.  Or what am I
> missing?

If a master file `foo` is specified in the local variables block,
AUCTeX checks whether it is exists, otherwise it gets created.  This
string `foo` must be given in the encoding specified by the `coding`
cookie.  In other words, the encoding *is* known; the user should
specify it explicitly so that Emacs doesn't select the wrong encoding
accidentally.


    Werner