[screen-devel] [bug #27586] broken support for unicode plane 1

[Nick Bowler]

Follow-up Comment #2, bug #27586 (project screen):

I just ran into this issue, so I tried out the unicode++ branch.

Sure enough, code points such as <U+26ED9> (𦻙) come out correctly, and
they seem to work in copy+paste, scrollback, writebuf, etc.

However, there are problems with the language tag characters (U+E0000 through
U+E007F, as they get mangled by screen.  For example, if I output the text:

  <U+E0001><U+E007A><U+E0068><U+9089><U+E007F> (󠀁󠁺󠁨邉󠁿).

Screen turns it into a bunch of garbage that mutates as you scroll or move
the copy cursor around.  The results differ every time the text is output,
too.  This text disrupts screen's notion of where lines start and end: after
printing this text, the copy mode cursor does not appear on the line that is
actually being copied.

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