Line height has extra padding

[jengelh]

Take the Mx437 Verite 8x16 font from int10h.org (or a distro package of the same, e.g. int10h-oldschoolpc-fonts). Using kmscon-9.0.0, kmscon --font-name "Mx437 Verite 8x16" --font-size=24, I run the Midnight Commander (mc), which produces the following display output, with gaps between the individual lines, where the line-drawing graphics are chopped up.

This would not happen in xterm or xfce4-terminal.