pkg/45221: xterm utf-8 mode is (partially) a one-way trip

[dholland%eecs.harvard.edu@localhost]

>Number:         45221
>Category:       pkg
>Synopsis:       xterm utf-8 mode is (partially) a one-way trip
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Aug 07 05:40:00 +0000 2011
>Originator:     David A. Holland
>Release:        NetBSD 5.99.49 (pkgsrc from 20110730)
>Organization:
>Environment:
System: NetBSD macaran 5.99.49 NetBSD 5.99.49 (MACARAN) #8: Mon Apr 11 19:54:18 
EDT 2011 dholland@macaran:/usr/src/sys/arch/amd64/compile/MACARAN amd64
Architecture: x86_64
Machine: amd64
>Description:

xterm-259 from pkgsrc X has the following problem:

If you
  - start it in non-utf-8 mode
  - switch to utf-8 mode with the ctrl-rightmouse menu
  - do some stuff
  - switch back to normal mode with the ctrl-rightmouse menu

then only output handling and not input handling switches back away
from utf-8. That is, if you print characters 128-255 from programs,
they're displayed as the matching iso-latin-1 glyphs; but if you paste
characters 128-255 into the xterm they are converted to utf-8 on the
way in and programs read them as multibyte sequences. This conversion
is apparently enabled when utf-8 mode is switched on, but not disabled
again when it's switched off.


>How-To-Repeat:

prepare something suitable in your cut buffer, open a fresh xterm, and
paste into cat as follows:

        % cat | hexdump -C
        <correct glyph>
        00000000  d8 0a                                             |..|
        00000002

switch on utf-8 mode:

        % cat | hexdump -C
        <correct glyph>
        00000000  c3 98 0a                                          |...|
        00000003

switch off utf-8 mode:

        % cat | hexdump -C
        <wrong glyph>
        00000000  c3 98 0a                                          |...|
        00000003

>Fix:

        dunno, probably obvious if you know where to look, which I don't.