Suppose I do a certain keystroke sequence in emacs, and nothing happens, even though I expect there to be a keybinding that would do something. This could be because:
- The keybinding is not actually present.
- The keybinding is invoking the command, but for some reason the command isn't having the expected effect.
How can I tell which of these it is? (The specific example is that I'm doing meta-q, which is supposed to be bound to the command fill-paragraph, but nothing seems to happen.)