Add extended keys flag for foot terminal.

Revamp extended keys support to more closely match xterm and support
mode 2 as well as mode 1. From Stanislav Kljuhhin (GitHub issue 4038).

This changes tmux to always request mode 2 from parent ter

Revamp extended keys support to more closely match xterm and support
mode 2 as well as mode 1. From Stanislav Kljuhhin (GitHub issue 4038).

This changes tmux to always request mode 2 from parent terminal, change
to an unambiguous internal representation of keys, and adds an option
(extended-keys-format) to control the format similar to the xterm(1)
formatOtherKeys resource.

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Use SM 2026 for Sync which is more widely supported now.

Setulc only does RGB colour so add Setulc1 to do non-RGB colours, GitHub
issue 3627.

Tweak previous to set and log the feature instead of just setting the
flag.

Parse primary device attributes as well as secondary and add a SIXEL
flag (not used yet), from Anindya Mukherjee.

Add some const, from Markus F X J Oberhumer.

Add support for OSC 8 hyperlinks (a VTE extension now supported by other
terminals such as iTerm2). Originally written by me then extended and
completed by first Will Noble and later Jeff Chiang. Git

Add support for OSC 8 hyperlinks (a VTE extension now supported by other
terminals such as iTerm2). Originally written by me then extended and
completed by first Will Noble and later Jeff Chiang. GitHub issues 911,
2621, 2890, 3240.

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kf* terminfo capabilities are poorly defined and rxvt uses them in a
different way from xterm, so add a feature flag for rxvt to make tmux
ignore the capabilities and instead rely on its builtin defi

kf* terminfo capabilities are poorly defined and rxvt uses them in a
different way from xterm, so add a feature flag for rxvt to make tmux
ignore the capabilities and instead rely on its builtin definitions.

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iTerm2 has OSC 7, from Gregory Anders.

Add a capability for OSC 7 and use it similarly to how the title is set
(and controlled by the same set-titles option). GitHub issue 3127.

Support underscore style with capture-pane -e, GitHub issue 2928.

Feature for the mouse since FreeBSD termcap does not have kmous.

Three changes to fix problems with xterm in VT340 mode, reported by
Thomas Sattler.

1) Do not include the DECSLRM or DECFRA features for xterm; they will be
added instead if secondary DA responds

Three changes to fix problems with xterm in VT340 mode, reported by
Thomas Sattler.

1) Do not include the DECSLRM or DECFRA features for xterm; they will be
added instead if secondary DA responds as VT420 (this happens
already).

2) Set or reset the individual flags after terminal-overrides is
applied, so the user can properly disable them.

3) Add a capability for DECFRA ("Rect").

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Use the setal capability as well as (tmux's) Setulc.

Properly escape a backslash.

Found by CompCert which notes that \E is not a valid escape sequence.

ok nicm@

Shorten some long lines.

Some other ctrl keys need to be translated with extended keys on.

Add a terminal feature for enable/disable extended keys (supported by
xterm and mintty) and add an option to make tmux send it. Only forward
extended keys if the application has requested them, even

Add a terminal feature for enable/disable extended keys (supported by
xterm and mintty) and add an option to make tmux send it. Only forward
extended keys if the application has requested them, even though we use
the CSI u sequence and xterm uses CSI 27 ~ - this is what mintty does as
well.

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Instead of having a default set of terminals in terminal-overrides that
get XT added and using that as a marker for xterm(1)-like, assume that
if the terminfo(5) entry already has XT or the clear cap

Instead of having a default set of terminals in terminal-overrides that
get XT added and using that as a marker for xterm(1)-like, assume that
if the terminfo(5) entry already has XT or the clear capability starts
with CSI then the terminal is VT100-like and it should be safe to send
DA requests. The DA responses trigger additional features being added.

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Add feature and capabilities for focus reporting. Also document AX and
XT even though they aren't tmux's, and add some bits for rxvt.

Add a feature for bracketed paste.

Add a feature for strikethrough.

Move terminal features into a single file.

Build list of paths and weed out duplicates before loading configs, and
add TMUX_SOCK like TMUX_PATH for the socket directory.