Enable (deep) copy of overrides.

This commit enables basic copy of overrides on generic ID level, as well
as from (deep) copy operators for objects and collections.

So e.g. if your linked overridden caracter is in a collection, you can
now (from the outliner) Duplicate that override collection to get a new
overriding copy of the character.

We still need operators (new or modifying existing ones) to handle that
from 3DView e.g.

Note that deep copy code for objects/collections (and incidently
animdata) had to be modified to avoid duplicating/making local IDs that
remain linked ones being used by overrides ones.

1 files changed, 3 insertions, 2 deletions

diff --git a/source/blender/blenkernel/intern/anim_data.c b/source/blender/blenkernel/intern/anim_data.c
index 9ab4e5c028d..cbb34cbee30 100644
--- a/source/blender/blenkernel/intern/anim_data.c
+++ b/source/blender/blenkernel/intern/anim_data.c
@@ -381,14 +381,15 @@ bool BKE_animdata_copy_id(Main *bmain, ID *id_to, ID *id_from, const int flag)
 
 void BKE_animdata_copy_id_action(Main *bmain, ID *id, const bool set_newid)
 {
+  const bool is_id_liboverride = ID_IS_OVERRIDE_LIBRARY(id);
   AnimData *adt = BKE_animdata_from_id(id);
   if (adt) {
-    if (adt->action) {
+    if (adt->action && (!is_id_liboverride || !ID_IS_LINKED(adt->action))) {
       id_us_min((ID *)adt->action);
       adt->action = set_newid ? ID_NEW_SET(adt->action, BKE_action_copy(bmain, adt->action)) :
                                 BKE_action_copy(bmain, adt->action);
     }
-    if (adt->tmpact) {
+    if (adt->tmpact && (!is_id_liboverride || !ID_IS_LINKED(adt->tmpact))) {
       id_us_min((ID *)adt->tmpact);
       adt->tmpact = set_newid ? ID_NEW_SET(adt->tmpact, BKE_action_copy(bmain, adt->tmpact)) :
                                 BKE_action_copy(bmain, adt->tmpact);