Adjust the logic when deleting last buffer to better preserve the
selection: if selecting the element below the deleted one fails (because
as the last one), select the one above it instead. From Dani

Adjust the logic when deleting last buffer to better preserve the
selection: if selecting the element below the deleted one fails (because
as the last one), select the one above it instead. From Daniel Mueller,
GitHub issue 4043.

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Use paste_is_empty to check if there are no buffers since paste_get_top
will return NULL if there are no automatic buffers.

Use -p for default paste-buffer command in buffer mode, it will only do
anything if the application asked for it. From Gregory Anders.

If there are no buffers, reset mode as soon as any key pressed. Fixes
crash reported by Gaoyang Zhang in GitHub issue 3373.

Spacing/style nits.

Hide struct args behind a couple of accessor functions.

Fix warnings, from Jan Tache in GitHub issue 2692.

Permit shortcut keys in buffer, client, tree modes to be configured with
a format; the default remains the line number. GitHub issue 2636.

Redraw any visible modes when status line changes so that formats like
the pane title are updated. GitHub issue 2487. Also a man page fix from
jmc.

Move editor stuff to common code in popup.c.

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.

Use VIS_CSTYLE for paste buffers also.

Add 'e' key in buffer mode to open the buffer in an editor.

Tweak the default choose modes formats:

- Only show pane title if it is not default and not empty.
- Add a prettier time format and use that instead of long ctime().
- Remove clutter and change the

Tweak the default choose modes formats:

- Only show pane title if it is not default and not empty.
- Add a prettier time format and use that instead of long ctime().
- Remove clutter and change the order.

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Some unnecessary assignments and unused variables.

Remove unused variables from Ben Boeckel, and a Pp from jmc.

Show UTF-8 in choose-buffer mode. From KOIE Hidetaka.

Style nits in function arguments.

Add a flag to reverse sort in the various choose modes, from Benjamin
Poirier in GitHub issue 1875.

Use VIS_CSTYLE for the arguments and add the missing escapes it can
generate to the parser.

Change display-menu from taking a single string to a set of arguments,
which is much easier to work with. Based on a diff from Avi Halachmi.

Add simple menus to tree, client, buffer modes.

Expand session and window formats for buffer filters.

Add format variables for the default formats for the various modes
(tree_mode_format and so on) and add a -a flag to display-message to
list variables with values.

DECRC and DECSC apparently need to preserve origin mode as well, based
on a fix from Marc Reisner.