Do not notify window-layout-changed if the window is about to be
destroyed (since it may have been freed by the time the notify happens),
from Romain Francoise in GitHub issue 3860.

Adjust size given to resize-pane for pane status line, GitHub issue
3050.

Rename a member to match what it will be in future.

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

Hide struct args behind a couple of accessor functions.

Fix some error strings, from Kris Katterjohn.

Drop having a separate type for style options and make them all strings,
which allows formats to be expanded. Any styles without a '#{' are still
validated when they are set but any with a '#{' are n

Drop having a separate type for style options and make them all strings,
which allows formats to be expanded. Any styles without a '#{' are still
validated when they are set but any with a '#{' are not. Formats are not
expanded usefully in many cases yet, that will be changed later.

To make this work, a few other changes:

- set-option -a with a style option automatically appends a ",".

- OSC 10 and 11 don't set the window-style option anymore, instead the
fg and bg are stored in the pane struct and act as the defaults that
can be overridden by window-style.

- status-fg and -bg now override status-style instead of trying to keep
them in sync.

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Move cmdq_state into cmd-queue.c.

Rename cmdq_shared to cmdq_state which will better reflect what it is
(going to be) used for.

Store a key event not a mouse event in the shared data.

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.

Add a -T flag to resize-pane to trim lines below the cursor, moving
lines out of the history. GitHub issue 2134.

Break code to convert an argument as a percentage into a common function.

Add support for percentage sizes for resize-pane ("-x 10%"). Also change
split-window and join-pane -l to accept similar percentages and
deprecate -p. From Anindya Mukherjee.

Correctly adjust mouse position if the status line is at the top and
more than one line. GitHub issue 1822.

Do not store the mouse position we calculate as the start of a drag back
into the mouse event that later code uses, it has been adjusted and they
should use the original position. GitHub issue 1710.

Fix mouse positioning when the pane is not entirely visible.

Some tidying and helper functions.

Minor cosmetic improvement from KOIE Hidetaka.

Make it possible to resize multiple panes by dragging corners, from Dan
Aloni in GitHub issue 1376.

Instead of working out which pane to resize with the mouse by walking
the panes list, look through the layout cells for the nearest border and
resize that cell. From Dan Aloni in GitHub issue 1374.

Change how we resolve which pane is dragging when there are multiple
options - choose the largest pane, which is more likely to be the one the
user wants to resize. Prompted by a report from Thomas S

Change how we resolve which pane is dragging when there are multiple
options - choose the largest pane, which is more likely to be the one the
user wants to resize. Prompted by a report from Thomas Sattler.

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Get rid of the extra layer of flags and cmd_prepare() and just store the
CMD_FIND_* flags in the cmd_entry and call it for the command. Commands
with special requirements call it themselves and updat

Get rid of the extra layer of flags and cmd_prepare() and just store the
CMD_FIND_* flags in the cmd_entry and call it for the command. Commands
with special requirements call it themselves and update the target for
hooks to use.

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Store state shared between multiple commands in the queue in a shared
structure.