To toggle on and off "Spellcheck continuously", I can
Click on "Abc" with the wavy underline, or go to Tools > Preferences > Language Settings > Spellchecker and check the box for "Spellcheck continuously".
How do I create a keyboard shortcut for this action (i.e. toggle on or off "Spellcheck continuously")?
(I tried following the instructions here but it turns out that when I toggle on or off "Spellcheck continuously", there's an insanely long set of messages/commands in the Messages Pane and I'm not sure how to translate that to a shortcut.)