[MlMt] http:// → http:??

[Quinn Comendant]

I've narrowed it down to these minimal conditions:

1. Using the font [`Iosevka`](https://github.com/be5invis/Iosevka) (I 
use the one installable via `brew install font-iosevka`).
2. In a MailMate compose window.
3. This minimal text (there is a single leading space before `ps`):

```
  ps://l
```

- Doesn't happen if I use a non-ligature version of Iosevka, e.g., 
`Iosevka Fixed`.
- Doesn't happen in other apps, e.g., TextEdit or TextMate.
- Doesn't happen if I change any characters in the string above, e.g., ` 
ps://x`.
- It's unrelated to the `mailto:` link from Airbnb, simply pasting in 
the above string into a compose window is enough.

I think the issue maybe related to [OpenType contextual 
alternates](https://lauraworthingtondesign.com/news/article/opentype-features) 
in the Iosevka font itself, although I'm unsure why I can't reproduce 
this in, e.g., TextMate.

Q

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