help-menu:about

This method is called when the about menu-item of the help-menu menu is selected. If help-menu:about is bound to #f instead of a procedure, the about menu item will not be created.

• (send a-frame:editor-mixin help-menu:about item evt) -> void
      item : (instance (derived-from menu-item%))
      evt : (instance control-event%)

  Calls message-box with a message welcoming the user to the application named by application:current-app-name