Could we support a keyboard shortcut to support switching language to "raw" similar to how there's one for switching to code or markdown? Jupyter uses "r" for this.
Raw cells can be converted to markdown with "m" shortcut, but not to code with "y" shortcut. I suppose one could adjust the "y" shortcut's "when" condition to resolve this (I haven't tried this) but I guess it should be fixed by default anyway.

Originally file here #16122