Minimum number of lines to update a gui window without clicking a button

["Moh B." <mohgtkmm gmail com>]

Hi Andrew,
Example 6 made it all clear now if canceling is desired.
Thanks a lot. I hope you don't stop helping us.
Reference: Andrew code:
https://mail.gnome.org/archives/gtkmm-list/2013-August/msg00159.html
 in response to: Minimum number of lines to update a Gtkmm gui window
without clicking a button.