bug#46515: Repeat mode

[Matt Armstrong]

Juri Linkov <juri@linkov.net> writes:

> Here is another incremental patch that adds more messaging...

Hey Juri, I like these ideas but don't feel qualified to review them
beyond what I've already said.  I have about three lines of edits in
Emacs code to my credit.  ;-) Perhaps discuss this idea on emacs-devel?

Thinking long term, I think it would be interesting to consider a future
where all of the various third party "modal" packages (evil, hydra,
etc.) could use higher level facilities provided by the Emacs core.
This patch is a step in that direction.  I'm interested to see how it
progresses.

Another interesting question: how do we surface how to use these
transient modes in Emacs help, if at all?