Support for formatting when editing code blocks?

[tp1415926535]

Is your feature request related to a problem? Please describe.
When editing a block of code, I would like to be able to format the code. Currently you can only format when editing an entire file.
I think this feature is important.

Describe the solution you'd like
When editing code block can use shortcuts, context menus, and commands to format code.

Describe alternatives you've considered
nothing

Additional context
Also I found that csharp language does not syntax highlight properly when editing code blocks. Whereas python or xml or whatever works fine. I hope this can be fixed.

[Kol9yN]

May integrate Prettier?