file-menu:save-as

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

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

  Prompts the user for a file name and uses that filename to save the buffer. Calls save-as with no arguments.