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

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

--- Comment #6 from Duane <parakleta@darkreality.org> ---
(In reply to Jan Beich from comment #4)

You are looking at the codes it transmits, not the codes that it receives. 
This is an example of application having default xterm behaviour if the xterm
termcap/terminfo is missing or broken.  The correct section of code is
https://github.com/tmux/tmux/blob/ceaf9b7452983423b679b25d905ce6750a0e299a/input.c#L2401-L2434

Here it accepts either 0 or 2 to change the title, but cross-referencing with
https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Operating-System-Commands
shows that the difference between them is that 0 can also change the icon name
as well as the title.

The absence of any handling for OSC 1 (just changing the icon name) suggests
that the correct thing to declare to set just the title would be OSC 2.  Using
OSC 0 in the capability may imply that the icon name is settable.

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