Bug 648776 - fixes symmetry painting after Massimo and Mitch's reviews.
Use a GType for the PROP_SYMMETRY property of GimpImage, and create a default "identity" symmetry for an image. I still use a GimpIntComboBox but store the property value in the user-data column because gpointer isn't a subset of gint. Adds in libgimpwidgets: - gimp_int_combo_box_set_active_by_user_data() - gimp_int_combo_box_get_active_user_data() - gimp_int_store_lookup_by_user_data() - gimp_prop_pointer_combo_box_new() to create a GimpIntComboBox and attach it to a gpointer property. Thanks Massimo and Mitch for reviewing my code.
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