Depsgraph: dependency on B-Bone start handle end roll when inheriting it.

Specifically the dependency is on any drivers that may be affecting
the RNA property of the handle bone, which currently link to segments.

1 files changed, 7 insertions, 1 deletions

diff --git a/source/blender/depsgraph/intern/builder/deg_builder_relations_rig.cc b/source/blender/depsgraph/intern/builder/deg_builder_relations_rig.cc
index fadce685d31..f8313dc854b 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_relations_rig.cc
+++ b/source/blender/depsgraph/intern/builder/deg_builder_relations_rig.cc
@@ -383,7 +383,13 @@ void DepsgraphRelationBuilder::build_rig(Object *object)
       bPoseChannel *prev, *next;
       BKE_pchan_bbone_handles_get(pchan, &prev, &next);
       if (prev) {
-        OperationKey prev_key(&object->id, NodeType::BONE, prev->name, OperationCode::BONE_DONE);
+        OperationCode opcode = OperationCode::BONE_DONE;
+        /* Inheriting parent roll requires access to prev handle's B-Bone properties. */
+        if ((pchan->bone->flag & BONE_ADD_PARENT_END_ROLL) != 0 &&
+            check_pchan_has_bbone_segments(object, prev)) {
+          opcode = OperationCode::BONE_SEGMENTS;
+        }
+        OperationKey prev_key(&object->id, NodeType::BONE, prev->name, opcode);
         add_relation(prev_key, bone_segments_key, "Prev Handle -> B-Bone Segments");
       }
       if (next) {