[gimp] libgimpwidgets: order enum combos of GimpDesaturateMode more logically

[Michael Natterer <mitch src gnome org>]

commit 461d807b05f4363cf8f2b13964511436f83f4b9a
Author: Michael Natterer <mitch gimp org>
Date:   Fri Mar 17 22:50:12 2017 +0100

    libgimpwidgets: order enum combos of GimpDesaturateMode more logically
    
    This is a bad hack that hardcodes a special case for
    GIMP_TYPE_DESATURATE_MODE right into gimp_prop_enum_combo_box_new(),
    we should think of something better if we get more special cases.

 libgimpwidgets/gimppropwidgets.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)
---
diff --git a/libgimpwidgets/gimppropwidgets.c b/libgimpwidgets/gimppropwidgets.c
index 722af62..bc3597e 100644
--- a/libgimpwidgets/gimppropwidgets.c
+++ b/libgimpwidgets/gimppropwidgets.c
@@ -528,7 +528,26 @@ gimp_prop_enum_combo_box_new (GObject     *config,
       combo_box = g_object_new (GIMP_TYPE_ENUM_COMBO_BOX,
                                 "model", store,
                                 NULL);
+      g_object_unref (store);
+    }
+  else if (param_spec->value_type == GIMP_TYPE_DESATURATE_MODE)
+    {
+      /* this is a bad hack, if we get more of those, we should probably
+       * think of something less ugly
+       */
+      GtkListStore *store;
 
+      store = gimp_enum_store_new_with_values (param_spec->value_type,
+                                               5,
+                                               GIMP_DESATURATE_LUMINANCE,
+                                               GIMP_DESATURATE_LUMA,
+                                               GIMP_DESATURATE_LIGHTNESS,
+                                               GIMP_DESATURATE_AVERAGE,
+                                               GIMP_DESATURATE_VALUE);
+
+      combo_box = g_object_new (GIMP_TYPE_ENUM_COMBO_BOX,
+                                "model", store,
+                                NULL);
       g_object_unref (store);
     }
   else