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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Incrementally display the Emacs command list filtered out by the
 input key words in real-time.
Date: Fri, 02 Jul 2021 09:25:52 +0300
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 (message from Hongyi Zhao on Fri, 2 Jul 2021 13:22:11 +0800)
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> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Fri, 2 Jul 2021 13:22:11 +0800
> 
> Say, when I input "foo bar", the matched command list are
> incrementally displayed immediately, and finally the ones which
> including "foo" and "bar" in any part of the candidate commands are
> filtered out. How do I configure my init file to implement this
> feature?

Explore the various completion styles, perhaps rearranging their order
in the variable completion-styles (see its doc string and the
documentation in the user manual for details).

And maybe try an alternative completion mode, like icompletion-mode.