Fix T96699: Splitting strip does not copy animation

Since e49bf4019b49, animation is handled explicitly. Split operator
wasn't updated.

Re-use backup-duplicate-restore animation functions, that other
operators use for splitting.

4 files changed, 56 insertions, 35 deletions

diff --git a/source/blender/editors/space_sequencer/sequencer_edit.c b/source/blender/editors/space_sequencer/sequencer_edit.c
index 3ccdf701a86..283bd99cd5d 100644
--- a/source/blender/editors/space_sequencer/sequencer_edit.c
+++ b/source/blender/editors/space_sequencer/sequencer_edit.c
@@ -1643,35 +1643,6 @@ void SEQUENCER_OT_split(struct wmOperatorType *ot)
 /** \name Duplicate Strips Operator
  * \{ */
 
-static void sequencer_backup_original_animation(Scene *scene, ListBase *list)
-{
-  if (scene->adt == NULL || scene->adt->action == NULL ||
-      BLI_listbase_is_empty(&scene->adt->action->curves)) {
-    return;
-  }
-
-  BLI_movelisttolist(list, &scene->adt->action->curves);
-}
-
-static void sequencer_restore_original_animation(Scene *scene, ListBase *list)
-{
-  if (scene->adt == NULL || scene->adt->action == NULL || BLI_listbase_is_empty(list)) {
-    return;
-  }
-
-  BLI_movelisttolist(&scene->adt->action->curves, list);
-}
-
-static void sequencer_duplicate_animation(Scene *scene, Sequence *seq, ListBase *curves_backup)
-{
-  GSet *fcurves = SEQ_fcurves_by_strip_get(seq, curves_backup);
-  GSET_FOREACH_BEGIN (FCurve *, fcu, fcurves) {
-    FCurve *fcu_cpy = BKE_fcurve_copy(fcu);
-    BLI_addtail(&scene->adt->action->curves, fcu_cpy);
-  }
-  GSET_FOREACH_END();
-}
-
 static int sequencer_add_duplicate_exec(bContext *C, wmOperator *UNUSED(op))
 {
   Scene *scene = CTX_data_scene(C);
@@ -1697,7 +1668,7 @@ static int sequencer_add_duplicate_exec(bContext *C, wmOperator *UNUSED(op))
    * original curves from backup.
    */
   ListBase fcurves_original_backup = {NULL, NULL};
-  sequencer_backup_original_animation(scene, &fcurves_original_backup);
+  SEQ_animation_backup_original(scene, &fcurves_original_backup);
 
   Sequence *seq = duplicated_strips.first;
 
@@ -1712,11 +1683,11 @@ static int sequencer_add_duplicate_exec(bContext *C, wmOperator *UNUSED(op))
       SEQ_select_active_set(scene, seq);
     }
     seq->flag &= ~(SEQ_LEFTSEL + SEQ_RIGHTSEL + SEQ_LOCK);
-    sequencer_duplicate_animation(scene, seq, &fcurves_original_backup);
+    SEQ_animation_duplicate(scene, seq, &fcurves_original_backup);
     SEQ_ensure_unique_name(seq, scene);
   }
 
-  sequencer_restore_original_animation(scene, &fcurves_original_backup);
+  SEQ_animation_restore_original(scene, &fcurves_original_backup);
 
   WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
   return OPERATOR_FINISHED;
@@ -2622,7 +2593,7 @@ static int sequencer_paste_exec(bContext *C, wmOperator *op)
    */
 
   ListBase fcurves_original_backup = {NULL, NULL};
-  sequencer_backup_original_animation(scene, &fcurves_original_backup);
+  SEQ_animation_backup_original(scene, &fcurves_original_backup);
   sequencer_paste_animation(C);
 
   /* Copy strips, temporarily restoring pointers to actual data-blocks. This
@@ -2654,7 +2625,7 @@ static int sequencer_paste_exec(bContext *C, wmOperator *op)
     }
   }
 
-  sequencer_restore_original_animation(scene, &fcurves_original_backup);
+  SEQ_animation_restore_original(scene, &fcurves_original_backup);
 
   DEG_id_tag_update(&scene->id, ID_RECALC_SEQUENCER_STRIPS);
   DEG_relations_tag_update(bmain);
diff --git a/source/blender/sequencer/SEQ_animation.h b/source/blender/sequencer/SEQ_animation.h
index 455e77fb4a3..f2c66393b65 100644
--- a/source/blender/sequencer/SEQ_animation.h
+++ b/source/blender/sequencer/SEQ_animation.h
@@ -19,6 +19,18 @@ struct Sequence;
 void SEQ_free_animdata(struct Scene *scene, struct Sequence *seq);
 void SEQ_offset_animdata(struct Scene *scene, struct Sequence *seq, int ofs);
 struct GSet *SEQ_fcurves_by_strip_get(const struct Sequence *seq, struct ListBase *fcurve_base);
+/**
+ * Move all `F-curves` from `scene` to `list`.
+ */
+void SEQ_animation_backup_original(struct Scene *scene, struct ListBase *list);
+/**
+ * Move all `F-curves` from `list` to `scene`.
+ */
+void SEQ_animation_restore_original(struct Scene *scene, struct ListBase *list);
+/**
+ * Duplicate `F-curves` used by `seq` from `list` to `scene`.
+ */
+void SEQ_animation_duplicate(struct Scene *scene, struct Sequence *seq, struct ListBase *list);
 
 #ifdef __cplusplus
 }
diff --git a/source/blender/sequencer/intern/animation.c b/source/blender/sequencer/intern/animation.c
index 47453ceda2b..27f7316e042 100644
--- a/source/blender/sequencer/intern/animation.c
+++ b/source/blender/sequencer/intern/animation.c
@@ -104,3 +104,32 @@ void SEQ_free_animdata(Scene *scene, Sequence *seq)
   GSET_FOREACH_END();
   BLI_gset_free(fcurves, NULL);
 }
+
+void SEQ_animation_backup_original(Scene *scene, ListBase *list)
+{
+  if (scene->adt == NULL || scene->adt->action == NULL ||
+      BLI_listbase_is_empty(&scene->adt->action->curves)) {
+    return;
+  }
+
+  BLI_movelisttolist(list, &scene->adt->action->curves);
+}
+
+void SEQ_animation_restore_original(Scene *scene, ListBase *list)
+{
+  if (scene->adt == NULL || scene->adt->action == NULL || BLI_listbase_is_empty(list)) {
+    return;
+  }
+
+  BLI_movelisttolist(&scene->adt->action->curves, list);
+}
+
+void SEQ_animation_duplicate(Scene *scene, Sequence *seq, ListBase *list)
+{
+  GSet *fcurves = SEQ_fcurves_by_strip_get(seq, list);
+  GSET_FOREACH_BEGIN (FCurve *, fcu, fcurves) {
+    FCurve *fcu_cpy = BKE_fcurve_copy(fcu);
+    BLI_addtail(&scene->adt->action->curves, fcu_cpy);
+  }
+  GSET_FOREACH_END();
+}
diff --git a/source/blender/sequencer/intern/strip_edit.c b/source/blender/sequencer/intern/strip_edit.c
index 60f3f35314e..2f76b6240cf 100644
--- a/source/blender/sequencer/intern/strip_edit.c
+++ b/source/blender/sequencer/intern/strip_edit.c
@@ -457,11 +457,18 @@ Sequence *SEQ_edit_strip_split(Main *bmain,
     return NULL;
   }
 
-  /* Move strips in collection from seqbase to new ListBase. */
+  /* Store `F-curves`, so original ones aren't renamed. */
+  ListBase fcurves_original_backup = {NULL, NULL};
+  SEQ_animation_backup_original(scene, &fcurves_original_backup);
+
   ListBase left_strips = {NULL, NULL};
   SEQ_ITERATOR_FOREACH (seq, collection) {
+    /* Move strips in collection from seqbase to new ListBase. */
     BLI_remlink(seqbase, seq);
     BLI_addtail(&left_strips, seq);
+
+    /* Duplicate curves from backup, so they can be renamed along with split strips. */
+    SEQ_animation_duplicate(scene, seq, &fcurves_original_backup);
   }
 
   SEQ_collection_free(collection);
@@ -511,6 +518,8 @@ Sequence *SEQ_edit_strip_split(Main *bmain,
     SEQ_ensure_unique_name(seq_rename, scene);
   }
 
+  SEQ_animation_restore_original(scene, &fcurves_original_backup);
+
   return return_seq;
 }