Allow to quickly toggle from raw to normal editor and back in order to preview and continue editing at the same place.

I suggested this in the context of equations editing: https://tolaria.canny.io/feature-requests/p/allow-math-formula-editing-in-the-wysiwyg-editor

But I think it may be a more general low hanging fruit for quick previewing while in the raw editor: a simple heuristic like "keep last raw cursor position if there was no further interaction with the normal editor" will do it, no need to map positions between views.