[gimp/gimp-2-10] app: make "gegl:introspect" an optional operation dependency.

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

commit f83fd22c4b8701ffc4ce14383e5e22756a4bce04
Author: Jehan <jehan girinstud io>
Date:   Mon Dec 14 19:53:38 2020 +0100

    app: make "gegl:introspect" an optional operation dependency.
    
    Check at runtime for the operation availability and set the "Show Image
    Graph" action active depending on this check.
    
    This goes with discussions to make this operation optional with a
    runtime check for the tool `dot`.
    See: https://gitlab.gnome.org/GNOME/gegl/-/merge_requests/84

 app/actions/debug-actions.c | 6 ++++++
 app/sanity.c                | 1 -
 2 files changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/app/actions/debug-actions.c b/app/actions/debug-actions.c
index 98a2f077be..70ceb0dcd0 100644
--- a/app/actions/debug-actions.c
+++ b/app/actions/debug-actions.c
@@ -98,4 +98,10 @@ void
 debug_actions_update (GimpActionGroup *group,
                       gpointer         data)
 {
+#define SET_SENSITIVE(action,condition) \
+        gimp_action_group_set_action_sensitive (group, action, (condition) != 0)
+
+  SET_SENSITIVE ("debug-show-image-graph", gegl_has_operation ("gegl:introspect"));
+
+#undef SET_SENSITIVE
 }
diff --git a/app/sanity.c b/app/sanity.c
index 0ad044aa0e..81120bbce9 100644
--- a/app/sanity.c
+++ b/app/sanity.c
@@ -650,7 +650,6 @@ sanity_check_gegl_ops (void)
     "gegl:hue-chroma",
     "gegl:illusion",
     "gegl:image-gradient",
-    "gegl:introspect",
     "gegl:invert-gamma",
     "gegl:invert-linear",
     "gegl:lens-blur",