follow-me-minibuffer.el

(use-package posframe)

(use-package mini-frame
  :after posframe
  :demand
  :custom
  (mini-frame-show-parameters
   (lambda()
     (let* ((width 1000)
            (height 300)
            (info (posframe-poshandler-argbuilder))
	    (posn (posframe-poshandler-point-top-left-corner
                   `(:posframe-width ,width :posframe-height ,height ,@info))))
       `((left . ,(car posn))
         (top . ,(cdr posn))
         (width . (text-pixels . ,width))
         (height . (text-pixels . ,height))))))
  (mini-frame-color-shift-step 15)
  (mini-frame-resize nil)
  :config
  (mini-frame-mode))