Request: Markdown helpers in the edit field

[tstirrat]

It would be good to have some context aware markdown helpers in the comment editor. Here are my big picks that drastically improve speed when writing PRs:

1. Paste link while text is selected -> auto linkifies. i.e. becomes [selected text](<link>)
2. Pressing ` with text selected surrounds that text in back ticks rather than replacing the text
3. Continue bullets when hitting return on a single line that already has * or -
4. Cmd + b to bold selected text, same for Cmd + i for italic

[samatcodeapprove]

👍 these are great improvements, thanks for the idea. I want to call out thought that (4) already works today, if it's not working for you that's a bug (it's working for me).

[tstirrat]

I did notice that (4) works not long after this, thanks!

[samatcodeapprove]

Pushing a build now that implements (1) and (2)!

(3) is still on the TODO list.