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Whilst working on accessibility improvements for system-config-printer,
I stumbled upon a weird behavior that I can’t seem to explain.

• Open system-config-printer. (Reproduced with any version, e.g. 1.5.* until master.)
• Hit F1 or open “Help” > “Troubleshoot”.

The window that opens is like a GtkAssistant or Wizard, but it’s actually
a GtkNotebook where the tabs are hidden. (See /usr/share/system-config-printer/troubleshoot/__init__.py, line 99: ntbk.set_show_tabs (False). You may comment that line to see the tabs.)

Nothing gets read in the first window, not even the “Next” button that
has the focus by default.

• Enable Orca’s “Flat Review” or “Say All” mode to have the window’s content
  read out loud. So far so good.
• Hit Return to activate the “Next” button. Internally, the self.current_page
  counter gets incremented, and visually you’ll be on to the next tab.
• Launch the Flat review again: Orca actually keeps reading the previous page.

I’m not sure whether it’s a Gtk or an Orca bug; I couldn’t come up with a
minimal GtkNotebook example that reproduces the issue.

Bonus question: if you can point me towards a mechanism that would enable
these windows to be read without requiring additional user action, that’d be swell :-/