[Bug 282647] termcap entries for tmux missing title setting capabilities (also for xterm?)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282647

Jan Beich <jbeich@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |bapt@FreeBSD.org

--- Comment #4 from Jan Beich <jbeich@FreeBSD.org> ---
(In reply to Duane from comment #0)
> :ts=\E]2;:fs=^G:

tmux uses :ts=\E]0;:fs=^G: per https://github.com/tmux/tmux/commit/295ace682020
which matches xterm+sl per
https://github.com/mirror/ncurses/blob/v6.4/misc/terminfo.src#L5709
FreeBSD homegrown termcap mostly follows terminfo except for POLA or features
that cannot be translated to termcap. So, this should be easy to fix but I
don't use termcap myself anymore.

(In reply to Duane from comment #3)
> Additionally, neither of the additional entries in terminfo-db contain the ts or fs capabilities so this doesn't solve that issue.

terminfo for tmux has use=xterm+sl but somehow base ncurses picks up termcap
unless an entry is only defined in terminfo e.g.,

$ pkg install terminfo-db
$ tmux set -g default-terminal tmux-direct
$ tmux respawn-pane -k
$ (tput ts; echo) | vis -o
\033]0;
$ (tput fs; echo) | vis -b
^G

CC @bapt per base b75fb12b6827 which suggested termcap to be used only as
fallback.

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