* Make display-panes block the client until a pane is chosen or it
times out.
* Clear history on RIS like most other terminals do.
* Add an "Any" key to run a command if a key is pressed that is not
bound in the current key table.
* Expand formats in load-buffer and save-buffer.
* Add a rectangle_toggle format.
* Add set-hook -R to run a hook immediately.
* Add README.ja.
* Add pane focus hooks.
* Allow any punctuation as separator for s/x/y not only /.
* Improve resizing with the mouse (fix resizing the wrong pane in some
layouts, and allow resizing multiple panes at the same time).
* Allow , and } to be escaped in formats as #, and #}.
* Add KRB5CCNAME to update-environment.
* Change meaning of -c to display-message so the client is used if it
matches the session given to -t.
* Fixes to : form of SGR.
* Add x and X to choose-tree to kill sessions, windows or panes.
CHANGES FROM 2.6 TO 2.7
* Remove EVENT_* variables from environment on platforms where tmux uses them
so they do not pass on to panes.
* Fixes for hooks at server exit.
* Remove SGR 10 (was equivalent to SGR 0 but no other terminal seems to do
this).
* Expand formats in window and session names.
* Add -Z flag to choose-tree, choose-client, choose-buffer to automatically
zoom the pane when the mode is entered and unzoom when it exits, assuming the
pane is not already zoomed. This is now part of the default key bindings.
* Add C-g to exit modes with emacs keys.
* Add exit-empty option to exit server if no sessions (defaults to on).
* Show if a filter is present in choose modes.
* Add pipe-pane -I to to connect stdin of the child process.
* Performance improvements for reflow.
* Use RGB terminfo(5) capability to detect RGB colour terminals (the existing
Tc extension remains unchanged).
* Support for ISO colon-separated SGR sequences.
* Add select-layout -E to spread panes out evenly (bound to E key).
* Support wide characters properly when reflowing.
* Pass PWD to new panes as a hint to shells, as well as calling chdir().
* Performance improvements for the various choose modes.
* Only show first member of session groups in tree mode (-G flag to choose-tree
to show all).
* Support %else in config files to match %if; from Brad Town in GitHub issue
1071.
* Fix "kind" terminfo(5) capability to be S-Down not S-Up.
* Add a box around the preview label in tree mode.
* Show exit status and time in the remain-on-exit pane text; from Timo
Boettcher in GitHub issue 1103.
* Correctly use pane-base-index in tree mode.
* Change the allow-rename option default to off.
* Support for xterm(1) title stack escape sequences (GitHub issue 1075 from
Brad Town).
* Correctly remove padding cells to fix a UTF-8 display problem (GitHub issue
1090).
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