Deselect the selected completion candidate when typing

minibuffer-choose-completion-or-exit submits the selected completion
candidate, if any, ignoring the contents of the minibuffer.  But a
user might select a completion candidate and then want to type
something else in the minibuffer and submit what they typed.

Now typing will automatically deselect the selected completion
candidate so that minibuffer-choose-completion-or-exit will not choose
it.

minibuffer-choose-completion has the same behavior as before, and is
not affected by the deselection.

* lisp/minibuffer.el (completion-auto-deselect, completions--deselect)
(completions--after-change): Add.
(minibuffer-completion-help): Add completions--after-change hook.
(minibuffer-next-completion): Bind completion-auto-deselect to nil to
avoid immediately deselecting the completion.
(minibuffer-choose-completion-or-exit): Bind
choose-completion-deselect-if-after so deselection takes effect.
(display-completion-list): Guarantee a newline at the beginning of
*Completions* to avoid ambiguity about candidate selection.
* lisp/simple.el (choose-completion-deselect-if-after): Add.
(choose-completion): Check choose-completion-deselect-if-after.
* etc/NEWS: Announce.

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