Re: Explanation Request for the Function set-transient-map in subr.el

[Stefan Monnier]

> What does this section do? In what situations this-command gets called using
> keys of the transient map but it is not equal to itself? What does mc mean?
>
> ((eq t keep-pred)
>   (let ((mc (lookup-key map (this-command-keys-vector))))
>   ;; If the key is unbound `this-command` is
>   ;; nil and so is `mc`.
>     (and mc (eq this-command mc))))

It checks whether the user used one of the bindings from the `map` as
opposed to one of the bindings from other active keymaps (e.g. the
global map).


        Stefan