anchor.diff:     :update-display
      :draw-rectangle
      :draw-text
  -   :clear
      :change-foreground
      :change-background))
   (in-package :lem-capi.lem-pane)
  
positive.code:        (setf (lem-pane-resized lem-pane) nil)
         (lem:send-event :resize)
         (reinitialize-pixmap lem-pane)
         (clear lem-pane)))))
  
  (defun update-font-if-required (lem-pane)
    (unless (lem-pane-normal-font lem-pane)
  
negative.code:              (gp:clear-rectangle (lem-pane-pixmap lem-pane)
                                   x y w h)))))))
  
  (defun change-foreground (lem-pane color)
    (when-let (color (convert-color color nil))
      (setf (capi:simple-pane-foreground lem-pane) color)))
  