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tags: upstream
It looks to me as if the fault is in the terminfo description for screen.
Screen does in fact understand ^N/^O, and processes them according to
ISO-2022. It does not simply pass them through, but rather processes
them itself, to invoke the G1 character set to GL.
However, screen's default value for "charset" is "BBBB02", which uses
US-ASCII as the G1 character set. Setting it to "B0BB02" uses the
box-drawing characters for G1, which would cause ^N/^O to behave as you
expect them to (and would render the terminfo description accurately).
Another way to invoke the box-drawing character set to G1 would be:
$ printf '\033)0'
(Note the ')', rather than '(').
That would cause no immediately visible change, but ^N/^O would start
working as you expect.
Note that, if you're running in UTF-8 mode, screen apparently uses the
Unicode box characters, rather than the parent terminal's smacs feature.
So, to sum up, either the terminfo description (and screen's $TERMCAP)
should specify '\E(0' / '\E)B', or else screen should default to
"B0BB02" for the value of "charset".
Forwarded upstream to: https://savannah.gnu.org/bugs/index.php?23646
- --
Micah J. Cowan
Programmer, musician, typesetting enthusiast, gamer,
and GNU Wget Project Maintainer.
http://micah.cowan.name/
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