on-close (augments, and augmentable only) in frame:open-here-mixin

Called just before the window is closed (e.g., by the window manager). This method is not called by show .

See also can-close?.

• (send a-frame:open-here-mixin on-close void

  Calls set-open-here-frame with #f if the result of get-open-here-frame is eq? to this.