The original kitty implementation used a passthrough approach where images
were forwarded directly to the outer terminal without being stored in tmux's
image cache.
This refactors kitty images to work like sixel images.
Kitty-capable terminals (kitty, ghostty, and others) can display
inline images via APC escape sequences.
Kitty's image support uses a passthrough model: APC sequences from
programs running inside panes are relayed verbatim to the outer
terminal with cursor positioning adjusted for the pane offset.
The outer terminal handles all image rendering and therefore itself must
be kitty-aware.
three ranges (will be needed for floating panes); move the visible
ranges checks outside of tty_draw_line and rewrite it to fix issues with
partially-obscured wide characters. With Michael Grant.
the same mechanism as palette requests to request clipboard from the
terminal and forward to the requesting pane. Remove the now-redundant
forward-to-pane ability from "refresh-client -l". GitHub issue 4275.
entry has not been set, send a request to the most recently used client
and forward any response instead. Based on change from Tim Culverhouse
in GitHub issue 4665.
will guess the theme from the background colour on terminals which do
not themselves support the escape sequence. Written by Jonathan
Slenders, GitHub issue 4353.
that it is emulating them by setting a bright (or bold) flag; however,
when the colour is changed from a bright colour (say SGR 96) to a
non-bright (say SGR 36), the flag is not reset, so the new colour
remains as bright. SGR 39 (default colour) also does not reset, so you
end up with the bright default colour. Work around this by sending SGR 0
when switching away from a bright colour, and disable AX for TERM=linux.
Also make the check for AX simpler and do not check for the op
capability is not actually used. GitHub issue 3976.
position rather than keeping the last character from the input stream,
this is how most terminals work and fixes problems with displaying these
characters in vim. GitHub issue 3600.
