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

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

--- Comment #3 from Duane <parakleta@darkreality.org> ---
That change seems like a backwards decision.  Instead of configuring the
program to not clear the screen when it exits, we lie about whether the
terminal is capable of clearing the screen?  If using `less` you just add the
`-X` option.

We now have the bizarre situation where `vim` for example seems to use its
internal terminal definitions if the terminal is listed as `xterm` because it
can no longer trust the provided termcap files as being complete.  It actually
does the clear if the TERM is exactly 'xterm', but not for derivative or other
values.

It leads to a weird circumstance where I get more reliable behaviour from
programs if I set the terminal to `xterm` regardless of what it really is
because then programs use their more complete capabilities themselves.  This is
how I actually discovered that these entries were missing from the FreeBSD
termcap files.

Additionally, neither of the additional entries in terminfo-db contain the ts
or fs capabilities so this doesn't solve that issue.

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