anchor.diff:                   :buffer buffer
                    :x 0
                    :y (- (display-height)
  -                       (minibuffer-window-height))
  +                       +minibuffer-window-height+)
                    :width (display-width)
  -                 :height (minibuffer-window-height)
  +                 :height +minibuffer-window-height+
                    :use-modeline-p nil
                    :frame frame))
   
  
positive.code: (defun minibuffer-window-p (window)
    (typep window 'sticky-minibuffer-window))
  (defun minibuffer-window-active-p () (eq (current-window) (minibuffer-window)))
  (defun minibuffer-window-height () *minibuffer-window-height*)
  (defun minibuffer () (window-buffer (minibuffer-window)))
  (defun minibufferp (buffer) (eq buffer (minibuffer)))
  
  
negative.code:           minibuffer-prompt-attribute
            minibuffer-window-p
            minibuffer-window-active-p
            minibufferp
            message
            message-without-log
  