line numbers pane

[davidmarkclements]

would be cool if we can figure out a way to limit the amount of character cells

for instance, there's a DIGIT TEN FULL STOP unicode char, that fits 10. into one cell,
unfortunately we can't cover all number combinations with this approach since we only get from 0. to 20.

a second possibility is drawing our own numbers as font cells, and then patching whatever font the system uses for terminal fonts, by adding our custom drawn cells to the "reserved" ranges. https://github.com/ryanoasis/nerd-fonts might be a starting place for figuring out how to do this