Reported window size includes window padding/unusable space

[mierak]

Executing tcgetwinsize in ghostty v1.0.0 includes the window-padding (non usable space) in its pixel dimensions. Other terminals do not seem to exhibit this behavior.

For example, executing python -c "import fcntl, termios, array; buf = array.array('H', [0,0,0,0]); fcntl.ioctl(1, termios.TIOCGWINSZ, buf); print(buf)" inside ghostty and kitty of identical sizes returns(rows, columns, width_px, height_px):

ghostty: array('H', [24, 133, 1200, 545])
kitty: array('H', [23, 133, 1197, 529])

As you can see, the width is perfectly divisible by column count - 1197/133 = 9 - in kitty(and foot, wezterm, didnt test others).

But in ghostty this results in a decimal number - 1200/133 = 9.02255639098.