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Julian Sparber authored
How `g_type_class_peek ()` was used it didn't return the correct parent class in most cases. G_DEFINE_TYPE macro creates a pointer we can use to get the parent class `n_p_parent_class`. Because we didn't use the correct parent class the object initialisation wasn't fully completed for some GtkWidgets. See https://developer.gnome.org/gobject/stable/chapter-gobject.html#gobject-instantiation for more information. This commit makes use of the `n_p_parent_class pointer` created for this specific use case where ever possible. Fixes: Librem5/calls#118