[gimp] Issue #1980 - Color picker wrong results when picking from non-sRGB...

[Ell <ell src gnome org>]

commit 9530b5cea3e4ec3c2c1e230e99273af2231c1a1c
Author: Ell <ell_se yahoo com>
Date:   Mon Aug 6 09:02:42 2018 -0400

    Issue #1980 - Color picker wrong results when picking from non-sRGB...
    
    ...image using "Sample Average"
    
    Also fix gimp_gegl_average_color(), which is where all current
    implementers of GimpPickable actually calculate the average.

 app/gegl/gimp-gegl-loops.cc | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/app/gegl/gimp-gegl-loops.cc b/app/gegl/gimp-gegl-loops.cc
index 1c5febf6f9..6e7929c9d2 100644
--- a/app/gegl/gimp-gegl-loops.cc
+++ b/app/gegl/gimp-gegl-loops.cc
@@ -1024,16 +1024,19 @@ gimp_gegl_average_color (GeglBuffer          *buffer,
     gint   n;
   } Sum;
 
-  const Babl        *average_format = babl_format ("RaGaBaA float");
+  const Babl        *average_format;
   GeglRectangle      roi;
-  GSList * volatile  sums           = NULL;
+  GSList * volatile  sums    = NULL;
   GSList            *list;
-  Sum                average        = {};
+  Sum                average = {};
   gint               c;
 
   g_return_if_fail (GEGL_IS_BUFFER (buffer));
   g_return_if_fail (color != NULL);
 
+  average_format = babl_format_with_space ("RaGaBaA float",
+                                           babl_format_get_space (format));
+
   if (! rect)
     rect = gegl_buffer_get_extent (buffer);