I love markdown and I love writing in it - but with long-form responses in GitHub, I often opt for 'Ctr+Enter' to save my comment rather than 'Preview' because hitting preview requires using the mouse and/or scrolling up away from where I currently am on the page. 1. Does anyone know of a keyboard shortcut to quickly toggle back and forth between 'edit' and 'preview' in GitHub comments and issues? 2. Any other clever ideas, like a WYSIWIG extension or side-by-side preview extension for comments editing?