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Fails to respond to gnome-session's EndSession request

When gnome-session wants to end the session it contacts each registered client in to see if that's o.k. When squeekboard thinks there's a keyboard attached that fails.

To verify:

  • use phosh with end-session-dialog (e.g. phosh!762 (merged) or master once merged)
  • hit 'poweroff'
  • end session dialog appears
  • then
# Check there's a inhibitor
$ gdbus introspect --session --dest org.gnome.SessionManager -o  /org/gnome/SessionManager | awk '/^  node Inhibitor/ { print $2 }
'Inhibitor4'
# Query that inhibitor
I=$(gdbus introspect --session --dest org.gnome.SessionManager -o  /org/gnome/SessionManager | awk '/^  node Inhibitor/ { print $2 }')

$ gdbus call --session -d org.gnome.SessionManager -o  /org/gnome/SessionManager/$I -m org.gnome.SessionManager.Inhibitor.GetReason
('Not responding',)

So squeekboard doesn't answer gnome-sessions QueryEndSesion request since the session registration isn't complete, this is the missing bit: https://gitlab.gnome.org/GNOME/gtk/-/blob/gtk-3-24/gtk/gtkapplication-dbus.c#L409

This leads to a dialog like:

foo