New Ligatures: M-Dash

[jacoby]

It is common to use -- as mdash; but it doesn't look like an m-dash ("–") but rather like two normal dashes together.

I like infixing protocol into arrows, like scratch --samba--> local, and the arrow looks good and transformed, but the tail still looks like --.

I'm loving FiraCode in most places I use mono fonts.

[dhouck]

I see two main with this:

1. The -- ligature already exists; it moves the hyphens closer together, because a lot of languages use it as decrement. Since this is a monospace font intended for programming, that usage is probably more common than as a dash of any sort.
2. It will be hard to tell how long a dash is. I already sometimes have this problem with == and I would not like more ligatures introduced which cause that type of problem.

[jacoby]

I honestly had forgotten decrement, which is stupid of me. Fair enough.

[tonsky]

Not much I can do because I want decrement to look like two minuses. But it’s a great idea, definetely deserves to be done in more traditional fonts.