When calling Gtk::Builder::get_widget () on a Gtk::FontChooserDialog
specified in Glade as a top-level window, this warning is issued:
gtkmm-WARNING **: gtkmm: Attempt to call Gtk::manage() on a
Gtk::Window, but a Gtk::Window has no parent container to manage its
lifetime.
While this is certainly true, the warning doesn't appear for similar
instances of Gtk::AboutDialog or Gtk::ColorChooserDialog. Is there
something special about the FontChooserDialog that warrants the warning?
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