LibOverride: Add initial support for adding new NLA tracks.

Also makes NLA tracks and strips overridable.

User can either edit existing strips in existing NLA tracks (but not add or remove them), and/or add new NLA tracks after those comming from the linked data.

Most of the work was as usual checking operators and adding protections against illegal operations in override context.

Note that since we can only rely on indices to deal with local added tracks, we forbid any local track being before any linked/original track.

Maniphest Tasks: T72629

Differential Revision: https://developer.blender.org/D9611

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/editors/transform/transform_convert.c b/source/blender/editors/transform/transform_convert.c
index c23ee5b771c..c81c954bd0a 100644
--- a/source/blender/editors/transform/transform_convert.c
+++ b/source/blender/editors/transform/transform_convert.c
@@ -1438,7 +1438,7 @@ void animrecord_check_state(TransInfo *t, struct Object *ob)
         /* only push down if action is more than 1-2 frames long */
         calc_action_range(adt->action, &astart, &aend, 1);
         if (aend > astart + 2.0f) {
-          NlaStrip *strip = BKE_nlastack_add_strip(adt, adt->action);
+          NlaStrip *strip = BKE_nlastack_add_strip(adt, adt->action, ID_IS_OVERRIDE_LIBRARY(id));
 
           /* clear reference to action now that we've pushed it onto the stack */
           id_us_min(&adt->action->id);