Fix missing group duplicated by hair in render

Was happening when viewport visibility on the particle system is disabled.
This became an issue after c45afcf, but the actual issue goes a bit deeper
and the following aspects were involved:

- Relations builder for particle system was ignoring particle system if
  it's visibility is not enabled for viewport. This is something what
  shouldn't have been done -- depsgraph relations are supposed to be the
  same no matter if it's viewport or render.

- Relation builder was only dealing with duplication set to object, but
  was ignoring group duplication.

This is technically a regression in 2.79a-RC as well, so would need to
backport this fix to the branch after extra testing is done here in the
studio.

1 files changed, 4 insertions, 1 deletions

diff --git a/source/blender/depsgraph/intern/builder/deg_builder_relations.h b/source/blender/depsgraph/intern/builder/deg_builder_relations.h
index aa55b9f66ae..aa8dc2a4982 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_relations.h
+++ b/source/blender/depsgraph/intern/builder/deg_builder_relations.h
@@ -66,11 +66,11 @@ struct bNodeTree;
 struct Object;
 struct bPoseChannel;
 struct bConstraint;
+struct ParticleSystem;
 struct Scene;
 struct Tex;
 struct World;
 struct EffectorWeights;
-struct ParticleSystem;
 
 struct PropertyRNA;
 
@@ -216,6 +216,9 @@ struct DepsgraphRelationBuilder
 	void build_world(World *world);
 	void build_rigidbody(Scene *scene);
 	void build_particles(Object *object);
+	void build_particles_visualization_object(Object *object,
+	                                          ParticleSystem *psys,
+	                                          Object *draw_object);
 	void build_cloth(Object *object, ModifierData *md);
 	void build_ik_pose(Object *object,
 	                   bPoseChannel *pchan,