Feedback on gnome-devel-demos/3.22/textview.vala.page

["T.K.Egan" <tkegan greenneondesign com>]

The code on https://developer.gnome.org/gnome-devel-demos/stable/textview.vala.html.en does not work as 
expected. Adding:

        this.show_all();

after:

        this.add (scrolled_window);

causes it to work as illustrated. I'm not clear on why but found it on the FileChooserDialog page

        https://developer.gnome.org/gnome-devel-demos/stable/filechooserdialog.vala.html.en