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#define XFCE_IS_HEADING_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), XFCE_TYPE_HEADING))
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#define XFCE_HEADING_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), XFCE_TYPE_HEADING, XfceHeadingClass))
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GType _xfce_heading_get_type (void) G_GNUC_CONST;
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void _xfce_heading_set_icon (XfceHeading *heading,