set-overwrite-mode

Enables or disables overwrite mode. See get-overwrite-mode. This method can be overridden to affect or detect changes in the overwrite mode.

• (send a-text:info-mixin set-overwrite-mode on?) -> void
      on? : boolean

  Calls the overwrite-status-changedmethod of the frame that is viewing this object. It uses get-canvas to get the canvas for this frame, and uses that's top-level-window<%> as the frame.