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Gobjectification for GstVaapiDisplay was almost done by the commit 185da3d1. But still something breaking GObject code convention remains, which is calling gst_vaapi_display_new() in each decendants. This patch replaces it with gst_vaapi_display_config(), defined in private header. https://bugzilla.gnome.org/show_bug.cgi?id=796470
a6881b9b