Font rendering in kitty is different from system's rendering

[tiberiuichim]

I'm using ArchLinux with Plasma 5.9 and I've attached a screenshot from Yakuake, a terminal that uses the Konsole engine. My problem is that the characters are too spaced out and fuzzy.

Left side is Kitty (installed from yaourt -S kitty-git), right side is Yakuake

[kovidgoyal]

What font is this?

fc-match monospace

[tiberiuichim]

LiberationMono-Regular.ttf: "Liberation Mono" "Regular"

But I've configured it to use "Cousine for Powerline", both terminals use the same font

[tiberiuichim]

This is a screenshot with just monospace

[kovidgoyal]

kitty calculates cell width by querying the sizes of all the ascii characters and taking the maximum width from that. See calc_cell_width() in freetype.py. I'm guessing it is because these fonts are not properly monospaced. Probably the underscore character is wider than all the other. You can stick a print statement in that function to confirm.