[Bug 294499] [termcap] screen entry has so=\E[3m (italic) should be so=\E[7m (reverse video)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294499

            Bug ID: 294499
           Summary: [termcap] screen entry has so=\E[3m (italic) should be
                    so=\E[7m (reverse video)
           Product: Base System
           Version: 14.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: freebsd@gushi.org

The screen entry in /etc/termcap has incorrect values for the standout mode
capabilities:

:se=\E[23m:so=\E[3m:

\E[3m is the ANSI escape sequence for italic, not standout/reverse video. The
correct values are:

:se=\E[27m:so=\E[7m:

This can be confirmed by noting that mr=\E[7m (reverse video) is correctly
defined in the same entry — the right escape sequence was available but placed
in the wrong capability.

The screen-256color entry inherits from screen via tc=screen and is therefore
also affected.

The practical effect is that applications linking against base libtinfow
display italic text where reverse video highlighting is expected. Confirmed
with Alpine 2.26 inside a GNU Screen 5.0.1 session on FreeBSD 14.

The fix is a one-line correction in the screen entry in /etc/termcap:

:se=\E[23m:so=\E[3m:   should be   :se=\E[27m:so=\E[7m:

Note that this entry ships in FreeBSD base and is present even on systems where
the sysutils/screen port has never been installed.

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