Implement window resizing via CSI t w/ param 8

[scrosland]

I'm using Ghostty 1.0.1 on macOS Sequoia 15.2.

I find it very convenient to be able to resize a terminal from the command line, but ghostty doesn't appear to support this yet.

I usually do this via CSI t with parameter 8 which resizes in characters. XTerm Control Sequences says:

CSI Ps ; Ps ; Ps t
Window manipulation (XTWINOPS), dtterm, extended by xterm.
...
Ps = 8 ; height ; width ⇒ Resize the text area to given
height and width in characters. Omitted parameters reuse the
current height or width. Zero parameters use the display's
height or width.

which I usually invoke via a shell function:

resize_terminal ()
{
    local width="$1";
    local height="$2";
    local command="\033[8;${height};${width}t";
    printf "${command}"
}

I see that ghostty does support CSI t size reporting with parameter 14 or 18 as per #476.

An alternative might be to add a +resize command to the ghostty CLI application.

[pluiedev]

FWIW this can't be easily implemented in Linux because GTK does not provide any APIs for resizing a window (fundamentally it's because Wayland doesn't allow windows to resize themselves). Having CSI 8; _; _ tonly work for macOS would be quite strange, though not impossible.