c_gtk_paint_hline

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GtkStyle* style, cairo_t* cr, GtkStateType stateType, GtkWidget* widget, gchar* detail, gint x1, gint x2, gint y) c_gtk_paint_hline;

Meta