Mode 2048 and CSI 14 t are size report control sequences which contain
the text area size in pixels. The text area is defined to be the extents
of the grid (rows and columns). Ghostty calculates the available size
for the text area by setting the available padding, and then filling as
much of the remaining space as possible. However, if there are remainder
pixels these are still reported as part of the text area size.

Pass the cell_size geometry through so that we can always report the
correct value: columns * cell width and rows * cell height.

When the focus reporting mode (1004) is enabled, send the current focus
state. This allows applications to track their own focus state without
first having to wait for a focus event (or query
it by sending a DECSET followed by a DECRST).

Ghostty's focus state is stored only in the renderer, where the termio
thread cannot access it. We duplicate the focus state tracking in the
Terminal struct with the addition of a new (1-bit) flag. We duplicate
the state because the renderer uses the focus state for its own purposes
(in particular, the Metal renderer uses the focus state to manage
its DisplayLink), and synchronizing access to the shared terminal state
is more cumbersome than simply tracking the focus state in the renderer
in addition to the terminal.

These sequences were implemented:

CSI 14 t - report the text area size in pixels
CSI 16 t - report the cell size in pixels
CSI 18 t - report the text area size in cells
CSI 21 t - report the window title

These sequences were not implemented because they manuipulate the window
state in ways that we do not want.

CSI 1 t
CSI 2 t
CSI 3 ; x ; y t
CSI 4 ; height ; width ; t
CSI 5 t
CSI 6 t
CSI 7 t
CSI 8 ; height ; width ; t
CSI 9 ; 0 t
CSI 9 ; 1 t
CSI 9 ; 2 t
CSI 9 ; 3 t
CSI 10 ; 0 t
CSI 10 ; 1 t
CSI 10 ; 2 t
CSI 24 t

These sequences were not implemented because they do not make sense in
a Wayland context:

CSI 11 t
CSI 13 t
CSI 14 ; 2 t

These sequences were not implemented because they provide information
about the screen that is unnecessary.

CSI 15 t
CSI 19 t

These sequences were not implemeted because Ghostty does not maintain an
icon title for windows.

CSI 20 t
CSI 22 ; 0 t
CSI 22 ; 1 t
CSI 23 ; 0 t
CSI 23 ; 1 t

These sequences were not implemented because of the additional
complexity of maintaining a stack of window titles.

CSI 22 ; 2 t
CSI 23 ; 2 t

https://gist.github.com/rockorager/e695fb2924d36b2bcf1fff4a3704bd83