[gegl] stretch-contrast-hsv: propagate space

[Øyvind "pippin" Kolås <ok src gnome org>]

commit a571af73c1e7aece0f42c2f088f00dcdd373b1e3
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Jul 5 22:58:24 2018 +0200

    stretch-contrast-hsv: propagate space

 operations/common/stretch-contrast-hsv.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/operations/common/stretch-contrast-hsv.c b/operations/common/stretch-contrast-hsv.c
index 673d82554..564e40db0 100644
--- a/operations/common/stretch-contrast-hsv.c
+++ b/operations/common/stretch-contrast-hsv.c
@@ -115,8 +115,9 @@ clean_autostretch_data (AutostretchData *data)
 static void
 prepare (GeglOperation *operation)
 {
-  gegl_operation_set_format (operation, "input",  babl_format ("HSVA float"));
-  gegl_operation_set_format (operation, "output", babl_format ("HSVA float"));
+  const Babl *space = gegl_operation_get_source_space (operation, "input");
+  gegl_operation_set_format (operation, "input",  babl_format_with_space ("HSVA float", space));
+  gegl_operation_set_format (operation, "output", babl_format_with_space ("HSVA float", space));
 }
 
 static GeglRectangle