Log Message:
tmux: Update to 3.4.

Submitted by kflu in NetBSD/pkgsrc#142, thanks!

CHANGES FROM 3.3a to 3.4

* Add options keep-last and keep-group to destroy-unattached to keep the last
  session whether in a group.

* Don't allow paste-buffer into dead panes.

* Add -t to source-file.

* Rewrite combined character handling to be more consistent and to support
  newer Unicode combined characters.

* Add basic support for SIXEL if built with --enable-sixel.

* Add a session, pane and user mouse range types for the status line and add
  format variables for mouse_status_line and mouse_status_range so they can be
  associated with different commands in the key bindings.

* Add flag (-o) to next-prompt/previous-prompt to go to OSC 133 command output.

* Add options and flags for menu styles (menu-style, menu-border-style) similar
  to those existing for popups.

* Add support for marking lines with a shell prompt based on the OSC 133 extension.

* Check for libterminfo for NetBSD.

* Add "us" to styles for underscore colour.

* Add flags (-c and -y) to change the confirm key and default behaviour of
  confirm-before.

* Use ncurses' new tparm_s function (added in 6.4-20230424) instead of tparm so
  it does not object to string arguments in c apabilities it doesn't already
  know. Also ignore errors from tparm if using previous ncurses versions.

* Set default lock command to vlock on Linux if present at build time.

* Discard mouse sequences that have the right form but actually are invalid.

* Add support for spawning panes in separate cgroups with systemd and a
  configure flag (--disable-cgroups) to turn off.

* Add a format (pane_unseen_changes) to show if there are unseen changes while
  in a mode.

* Remove old buffer when renaming rather than complaining.

* Add an L modifier like P, W, S to loop over clients.

* Add -f to list-clients like the other list commands.

* Extend display-message to work for control clients.

* Add a flag to display-menu to select the manu item selected when the menu is
  open.

* Have tmux recognise pasted text wrapped in bracket paste sequences, rather
  than only forwarding them to the program inside.

* Have client return 1 if process is interrupted to an input pane.

* Query the client terminal for foreground and background colours and if OSC 10
  or 11 is received but no colour has been set inside tmux, return the colour
  from the first attached client.

* Add send-keys -K to handle keys directly as if typed (so look up in key
  table).

* Process escape sequences in show-buffer.

* Add a -l flag to display-message to disable format expansion.

* Add paste-buffer-deleted notification and fix name of paste-buffer-changed.

* Do not attempt to connect to the socket as a client if systemd is active.

* Add scroll-top and scroll-bottom commands to scroll so cursor is at top or
  bottom.

* Add a -T flag to capture-pane to stop at the last used cell instead of the
  full width. Restore the previous behaviour by making it default to off unless
  -J is used.

* Add message-line option to control where message and prompt go.

* Notification when a when a paste buffer is deleted.

* Add a Nobr terminfo(5) capability to tell tmux the terminal does not use bright
  colours for bold.

* Change g and G to go to top and bottom in menus.

* Add a third state "all" to allow-passthrough to work even in \ 
invisible panes.

* Add support for OSC 8 hyperlinks.

* Store the time lines are scrolled into history and display in copy mode.

* Add a %config-error reply to control mode for configuration file errors since
  reporting them in view mode is useless.

* A new feature flag (ignorefkeys) to ignore terminfo(5) function key
  definitions for rxvt.

* Pass through first argument to OSC 52 (which clipboards to set) if the
  application provides it.

* Expand arguments to send-keys, capture-pane, split-window, join-pane where it
  makes sense to do so.

* Ignore named buffers when choosing a buffer if one is not specified by the user.