Re: texinfo.tex: non-ASCII support completely broken for XeTeX and LuaTeX

[Gavin Smith]

On Sun, Dec 25, 2022 at 07:19:01AM +0000, Werner LEMBERG wrote:
> 
> [texinfo.tex 2022-12-19.22]
> 
> 
> Consider this input file
> 
> ```
> \input texinfo
> ·
> @bye
> ```
> 
> (the character is U+00B7, MIDDLE DOT).  Only pdfTeX produces this
> character; both XeTeX and LuaTeX silently discard it.

All the characters work with "@documentencoding UTF-8".  UTF-8 is supposed
to be the default input encoding but evidently this isn't the case for
XeTeX and LuaTeX.

I have tested the change below both with and without the @documentencoding
declaration as well as with @documentencoding ISO-8859-1 and it seems to
work properly.  I committed this change in version 2022-12-25.13.

--- a/doc/texinfo.tex
+++ b/doc/texinfo.tex
@@ -11233,13 +11231,15 @@ directory should work if nowhere else does.}
    \relax
 }
 
-% Define all Unicode characters we know about.  This makes UTF-8 the default
-% input encoding and allows @U to work.
+% Define all Unicode characters we know about
+% and make UTF-8 the default encoding.
 \iftxinativeunicodecapable
   \nativeunicodechardefsatu
 \else
   \utfeightchardefs
 \fi
+\documentencodingzzz{UTF-8}
+
 
 \message{formatting,}