invalidate-bitmap-cache in editor<%>

When on-paint is overridden, call this method when the state of on-paint's drawing changes.

• (send an-editor invalidate-bitmap-cache x y width height) -> void
     x = 0.0 : real number
     y = 0.0 : real number
     width = 'end : non-negative real number or 'end
   height = 'end : non-negative real number or 'end

  The x, y, width, and height arguments specify the area that needs repainting in editor coordinates. If width/height is 'end, then the total height/width of the editor (as reported by get-extent) is used. Note that the editor's size can be smaller than the visible region of its display.

  The default implementation triggers a redraw of the editor, either immediately or at the end of the current edit sequence (if any) started by begin-edit-sequence.