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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: not quite understanding input methods
Date: Mon, 30 Aug 2021 22:08:55 +0300
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To: "Perry E. Metzger" <perry@piermont.com>
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> Date: Mon, 30 Aug 2021 15:00:21 -0400
> From: "Perry E. Metzger" <perry@piermont.com>
> 
> Having thought about this, is `read_char` actually going to be called 
> under these circumstances? Remember that I've bound "<f19>" to a 
> function that inserts a character into the buffer, and it is that 
> character in the buffer that is in the quail rule. I may be confused 
> about how all of this works, of course.

Before a key sequence bound to a command causes that command to be
invoked, it (the key sequence) must be read, and that's the job of
read_char.  Only after F19 is read, Emacs calls the command to which
you bound it, and that command inserts a character into the buffer.