Add an option allowing users to override the width of individual Unicode
codepoints (overriding tmux's default list).

Add two new style parameters, width and pad, which apply to scrollbars.
From Michael Grant, GitHub issue 4241.

Add an option to control the input buffer size, from Ken Lau.

Add support for a scrollbar at the side of each pane. New options
pane-scrollbars turn them on or off, pane-scrollbars-position sets the
position (left or right), and pane-scrollbars-style to set the

Add support for a scrollbar at the side of each pane. New options
pane-scrollbars turn them on or off, pane-scrollbars-position sets the
position (left or right), and pane-scrollbars-style to set the colours.
Mouse support will come later. From Michael Grant in GitHub issue 4221.

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Expand full array option values if no index is provided, GitHub issue
4051.

Check cursor options when a pane is created, not just when they are changed.

Add an option to set the character used for unused areas of the
terminal, GitHub issue 3110.

Add a cursor-style option, from Alexis Hildebrandt in GitHub issue 2960.

Add a cursor-colour option, from Alexis Hildebrandt in GitHub issue
2959.

Add popup-border-lines option to set popup line style, from Alexis
Hildebrandt, GitHub issue 2930.

Stop caring about empty commands, just treat as a null command.

Break the colour palette into a struct rather than just a single array
and use that to support the OSC palette-setting sequences in popups.
Also add a pane-colours array option to specify the default

Break the colour palette into a struct rather than just a single array
and use that to support the OSC palette-setting sequences in popups.
Also add a pane-colours array option to specify the defaults. GitHub
issue 2815.

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Add split-window -Z to start the pane zoomed, GitHub issue 2591.

Hide some warnings on newer GCC versions, GitHUb issue 2525.

Allow colour to be spelt as color, from Boris Verkhovsky. GitHub issue
2317.

d and D keys to reset to default in customize mode.

Separate key flags and modifiers, log key flags, make the "xterm" flag
more explicit and fix M- keys with a leading escape.

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.

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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Style nits in function arguments.

Rewrite options_array_set to be clearer and remove a spurious warning
with newer GCC. From Ben Boeckel.

Memory leaks, from Igor Wong in GitHub issue 1934.

Do not always set scope for panes because the window check might fail,
GitHub issue 1810.

FIx return of options_scope_from_name on error.

Add a per-pane option set. Pane options inherit from window options (so
there should be no change to existing behaviour) and are set and shown
with set-option -p and show-options -p.

Change remain-o

Add a per-pane option set. Pane options inherit from window options (so
there should be no change to existing behaviour) and are set and shown
with set-option -p and show-options -p.

Change remain-on-exit and window-style/window-active-style to be pane
options (some others will be changed later).

This makes select-pane -P and -g unnecessary so no longer document them
(they still work) and no longer document set-window-option and
show-window-options in favour of set-option -w and show-options -w.

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