I accidentally pressed some keys and found a feature that looked really useful. It gave me the option to hierarchically select a command/function to run in the minibuffer. There was some explanatory text at the top, saying I could use PageUp to go to the window to select completions. I hesitate to call it completions, because, while it was very similar to the window you get with M-x ?, it wasn't that (for one, that text about PageUp isn't there).

With the latter you get an alphabetical list of commands. With the feature I stumbled upon, there was some hierarchy to it. E.g. there was an option "file". When I selected that with f I got more options, like find-file.

I immediately installed command-log-mode, but I haven't reached it again so far.

Emacs version: GNU Emacs 27.1 (build 1, x86_64-w64-mingw32) of 2020-08-21

  • 3
    The command view-lossage, bound to C-h l, will be helpful if this sort of thing happens again: it shows you what keys you pressed and what command they ran. – Fran Burstall Mar 4 at 10:38
  • Thanks, good to know! – contr.error Mar 4 at 16:57
  • Since you say "stock Emacs", meaning I guess that you aren't talking about using any 3rd-party libraries, please specify your Emacs version: M-x emacs-version. – Drew Mar 4 at 23:26

I downloaded the emacs sources and grepped for the text I remembered. Apparently I just described the text interface to the menu bar, reached with M-` by default. Case closed (and not as useful as it looked at first glance).

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