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Uses of various deprecated functions have been replaced to build with -Werror. This also obsoletes the custom generic_menu_position_func as gtk_menu_popup_at_widget should be enough for the drop down menu in the volume toolbar. The call of gtk_style_context_set_background has been removed because it did not have an effect since some GTK releases. https://bugzilla.gnome.org/show_bug.cgi?id=780864
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