Pop up input box so I see the comments side-by-side with my response

[PaulRBerg]

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Superhuman (the email client) has this awesome feature where I can pop out the editor to the side (using the SHIFT+⌘+P keyboard shortcut). This makes it possible to see the other person's email side-by-side with the response that I am writing in real-time.

It would be helpful to be able to do this on GitHub. I often find myself scrolling up and down in an issue or a discussion to remember what the other person has said.

Here's a screenshot to visually explain my feature request: