https://emacs.stackexchange.com/questions/42287/focus-echo-area

other-window-or-prompt.el

;; (global-set-key [remap other-window] 'other-window-or-prompt)
(defun other-window-or-prompt (count &optional all-frames)
  "Calls `other-window' as you'd expect from \\[C-x o] with the exception when
there is an active prompt. In this case the minibuffer
window will become active. If the prompt was active on a different frame than
the current one that frame will be gain focus."
  (interactive "p")
  (if (minibuffer-prompt)
      (unwind-protect
	  (let* ((minibuf (active-minibuffer-window))
		 (minibuf-frame (window-frame minibuf)))

	    (unless (equal minibuf-frame (selected-frame))
	      (select-frame minibuf-frame)
	      (raise-frame minibuf-frame))

	    (when (window-live-p minibuf)
	      (select-window minibuf))))
    (other-window count all-frames)))