(SQL Lab) can not show newline

[Hokwang]

A clear and concise description of what the bug is.

How to reproduce the bug

1. Go to 'SQL Lab'
2. use query SELECT E'First Line\nSecond line.'
3. click "RUN"

Expected results

show newline

Actual results

it shows '\n' to space

Screenshots

Environment

(please complete the following information):

• browser type and version: chrome
• superset version: 2.1.0

Installed using helm chart

Checklist

Make sure to follow these steps before submitting your issue - thank you!

• I have checked the superset logs for python stacktraces and included it here as text if there are any.
• I have reproduced the issue with at least the latest released version of superset.
• I have checked the issue tracker for the same issue and I haven't found one similar.

Additional context

Add any other context about the problem here.

[Hokwang]

@justinpark could you help this issue?

[rusackas]

While a legit issue, and still present in Superset 4.0, this issue doesn't seem to be bothering too many people, and is at risk of being closed as stable. Using HTML rendering might be a workaround, otherwise PRs are welcome.