[gegl] mix, piecewise-blend: add "compositors:blend" categories

[Ell <ell src gnome org>]

commit a4a83068a3ca55eca7a0f79b08e0ab5388f89b41
Author: Ell <ell_se yahoo com>
Date:   Tue Jun 2 23:09:35 2020 +0300

    mix, piecewise-blend: add "compositors:blend" categories

 operations/common-cxx/piecewise-blend.cc | 2 +-
 operations/common/mix.c                  | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/operations/common-cxx/piecewise-blend.cc b/operations/common-cxx/piecewise-blend.cc
index 8ebf3f1d7..7b853c118 100644
--- a/operations/common-cxx/piecewise-blend.cc
+++ b/operations/common-cxx/piecewise-blend.cc
@@ -344,7 +344,7 @@ gegl_op_class_init (GeglOpClass *klass)
   gegl_operation_class_set_keys (operation_class,
     "name",        "gegl:piecewise-blend",
     "title",       _("Piecewise Blend"),
-    "categories",  "blend",
+    "categories",  "compositors:blend",
     "description", _("Blend a chain of inputs using a mask"),
     NULL);
 }
diff --git a/operations/common/mix.c b/operations/common/mix.c
index e3119cd07..2edc4295f 100644
--- a/operations/common/mix.c
+++ b/operations/common/mix.c
@@ -110,6 +110,7 @@ gegl_op_class_init (GeglOpClass *klass)
   gegl_operation_class_set_keys (operation_class,
     "name"       , "gegl:mix",
     "title",       _("Mix"),
+    "categories", "compositors:blend",
     "reference-hash", "20c678baa5b1f5c72692ab9dce6a5951",
     "description",
           _("Do a lerp, linear interpolation (lerp) between input and aux"),