[gegl] gegl:stretch-contrast-hsv: opt out of auto-threading

[Øyvind Kolås <ok src gnome org>]

commit c87ef925b7a0f74e0581d2a4e922d8b4abe0881c
Author: Øyvind Kolås <pippin gimp org>
Date:   Sat Aug 12 22:52:21 2017 +0200

    gegl:stretch-contrast-hsv: opt out of auto-threading

 operations/common/stretch-contrast-hsv.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/operations/common/stretch-contrast-hsv.c b/operations/common/stretch-contrast-hsv.c
index 632b6ad..673d825 100644
--- a/operations/common/stretch-contrast-hsv.c
+++ b/operations/common/stretch-contrast-hsv.c
@@ -241,6 +241,7 @@ gegl_op_class_init (GeglOpClass *klass)
   filter_class->process                    = process;
   operation_class->prepare                 = prepare;
   operation_class->process                 = operation_process;
+  operation_class->threaded                = FALSE;
   operation_class->get_required_for_output = get_required_for_output;
   operation_class->get_cached_region       = get_cached_region;