Playground text field does not capture tabbing

[RaphGL]

When tab is pressed instead of inserting a tab or x number of spaces where the cursor is it instead tabs over to the next items in the webpage. This makes the playground annoying to use for anyone used to using tabs instead of spaces.

[sabine]

@RaphGL Thank you for reporting. I agree that's annoying. Not sure when we'll get to it. I think we're using codemirror on that div - maybe we need to upgrade or configure properly.