Restore previous behaviour or writing to stdout if available.

Add -c to run-shell to set working directory, from someone in GitHub
issue 3661.

Do not attempt to use client in config file (it will be NULL), GitHub
issue 3206.

Add a way for lines added to copy mode to be passed through the parser
to handle escape sequences and use it for run-shell, GitHub issue 3156.

Add -e flag to set environment for popup, from Alexis Hildebrandt in
GitHub issue 2924.

Fix run-shell -d with no command, GitHub issue 2885.

For the moment, restore if-shell and run-shell to parsing at the last
moment (when the shell command completes) rather than when first
invoked, GitHub issue 2872.

Expand argument to run-shell again.

Validate command argument types (string or command list) and give more
useful error messages.

Move command argument parsing common functions and don't bother to parse
again if given a command rather than a string.

Add args parsing callback for some future work, currently unused.

Hide struct args behind a couple of accessor functions.

Set return code for confirm-before and make command-prompt also block,
GitHub issue 2822.

Add a flag to disable keys to close a message, GitHub issue 2625.

Do not crash if there is no item to show command error, from Anindya
Mukherjee.

Drop support for popups where the content is provided directly to tmux
(which does not have many practical uses) and only support running a
program in the popup. display-popup is now simpler and can

Drop support for popups where the content is provided directly to tmux
(which does not have many practical uses) and only support running a
program in the popup. display-popup is now simpler and can accept
multiple arguments to avoid escaping problems (like the other commands).

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Add a -C flag to run-shell to use a tmux command rather than a shell command.

Do not wait on shutdown for commands started with run -b.

Add a customize mode where keys and options may be browsed and changed,
includes adding a brief description of each option. Bound to "C" by
default.

Make client -c and -t handling common in cmd-queue.c and try to be
clearer about whether the client is the target client (must have a
session) or not.

Also move cmdq_item and cmdq_list into cmd-queue.c (this is to make its
use more clearly defined and preparation for some future work).

Make struct cmd local to cmd.c and move it out of tmux.h.

Now that copy mode copies the pane content rather than keeping a
reference to it, it isn't necessary that the pane in copy mode is the
same as the one copying from. Add a -s flag to copy-mode to spec

Now that copy mode copies the pane content rather than keeping a
reference to it, it isn't necessary that the pane in copy mode is the
same as the one copying from. Add a -s flag to copy-mode to specify a
different pane for the source content. This means it is possible to view
two places in a pane's history at the same time in different panes, or
copy from a pane's history into an editor or shell in the same pane.

From Anindya Mukherjee.

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Preserve exit status from run-shell and pass to the client.

Add a flag to run a background process in a pty as well, not used for
anything yet.