c_gtk_icon_set_render_icon

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)
GdkPixbuf* function(GtkIconSet* iconSet, GtkStyle* style, GtkTextDirection direction, GtkStateType state, GtkIconSize size, GtkWidget* widget, const(char)* detail) c_gtk_icon_set_render_icon;

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