Re: Cancel minibuffer when clicking another window

On Wed, Mar 04 2026, Stephen Berman wrote:
> On Wed, 04 Mar 2026 12:47:15 +0100 Joost Kremers <[email protected]> wrote:
>
>> Hi list,
>>
>> When Emacs reads input in the minibuffer (i.e., with `read-from-minibuffer`
>> or `completing-read`, etc.) and you click some other window with the mouse,
>> that window is selected, but the minibuffer input isn't cancelled.
>>
>> Is there a way to automatically cancel the minibuffer input when clicking
>> another window?
>
> Maybe this does what you want:
>
> (defun my-exit-minibuffer ()
>   (let ((miniwin (active-minibuffer-window)))
>     (when (and miniwin (not (eq miniwin (selected-window)))
> 	       (mouse-event-p last-command-event)
>       (exit-minibuffer)))))
>
> (add-hook 'post-command-hook #'my-exit-minibuffer)

Thanks! Though with `exit-minibuffer`, the item that's selected is chosen
and the action that the minibuffer was started for is executed with that
value, which is not what I want. (So when I'm doing `switch-to-buffer`, the
window I click on actually switches to the buffer that is highlighted in
the minibuffer; using vertico, that is.)

But this variant seems to work:

```
(defun my-exit-minibuffer ()
  (let ((miniwin (active-minibuffer-window)))
    (when (and miniwin (not (eq miniwin (selected-window)))
	       (mouse-event-p last-command-event)
               (throw 'exit (lambda () (signal 'minibuffer-quit nil)))))))
```


-- 
Joost Kremers
Life has its moments