[Bug 6930] New: Terminal escape sequences in prompts are broken

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=6930

            Bug ID: 6930
           Summary: Terminal escape sequences in prompts are broken
           Product: Mercurial
           Version: 6.8.1
          Hardware: PC
                OS: NetBSD
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at mercurial-scm.org
          Reporter: mercurial-bugzilla at campbell.mumble.net
                CC: mercurial-devel at mercurial-scm.org
    Python Version: ---

Some time between 6.7.4 on Python 3.11 and 6.8.1 on Python 3.12, color prompts
broke in my environment:

$ hg amend -i
diff --git a/tests/lib/libc/sys/t_select.c b/tests/lib/libc/sys/t_select.c
1 hunks, 1 lines changed
[0;33mexamine changes to 'tests/lib/libc/sys/t_select.c'?[0m[0;33m(enter ? for
help) [Ynesfdaq?][0m 

In 6.7.4, the prompt was displayed in yellow text with a line break between the
question and the parenthesis, and the escape sequences were sent to the
terminal rather than displayed:

$ hg amend -i
diff --git a/tests/lib/libc/sys/t_select.c b/tests/lib/libc/sys/t_select.c
1 hunks, 1 lines changed
examine changes to 'tests/lib/libc/sys/t_select.c'?
(enter ? for help) [Ynesfdaq?] 

Environment variables:

TERM=screen
HOME=/home/riastradh
TMPDIR=/tmp/riastradh
LANG=C.UTF-8
PATH=/bin:/sbin:/home/riastradh/usr/bin:/usr/bin:/usr/sbin

(screen is running under rxvt-unicode but that is unlikely to be relevant.)

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