Fix T51624: Scene Full Copy ignores shader node links.

Properly remap nodes' pointers to copied IDs in copied ntrees.

Note that this only affects root trees, node groups are not concerned
here, since they are assumed to be reusable chunks and hence *not*
duplicated.

1 files changed, 13 insertions, 0 deletions

diff --git a/source/blender/editors/object/object_relations.c b/source/blender/editors/object/object_relations.c
index 5a0921f7119..7ec43b02b38 100644
--- a/source/blender/editors/object/object_relations.c
+++ b/source/blender/editors/object/object_relations.c
@@ -83,6 +83,7 @@
 #include "BKE_mball.h"
 #include "BKE_mesh.h"
 #include "BKE_modifier.h"
+#include "BKE_node.h"
 #include "BKE_object.h"
 #include "BKE_report.h"
 #include "BKE_sca.h"
@@ -2102,6 +2103,18 @@ void ED_object_single_users(Main *bmain, Scene *scene, const bool full, const bo
 		single_tex_users_expand(bmain);
 	}
 
+	/* Relink nodetrees' pointers that have been duplicated. */
+	FOREACH_NODETREE(bmain, ntree, id)
+	{
+		/* This is a bit convoluted, we want to root ntree of copied IDs and only those,
+		 * so we first check that old ID has been copied and that ntree is root tree of old ID,
+		 * then get root tree of new ID and remap its pointers to new ID... */
+		if (id->newid && (&ntree->id != id)) {
+			ntree = ntreeFromID(id->newid);
+			BKE_libblock_relink_to_newid(&ntree->id);
+		}
+	} FOREACH_NODETREE_END
+
 	/* Relink datablock pointer properties */
 	{
 		IDP_RelinkProperty(scene->id.properties);