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.

2 files changed, 10 insertions, 3 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) {
diff --git a/source/blender/makesrna/intern/rna_armature.c b/source/blender/makesrna/intern/rna_armature.c
index ffd28b4eb76..0eec5973ab0 100644
--- a/source/blender/makesrna/intern/rna_armature.c
+++ b/source/blender/makesrna/intern/rna_armature.c
@@ -635,9 +635,10 @@ void rna_def_bone_curved_common(StructRNA *srna, bool is_posebone)
   if (is_posebone == false) {
     prop = RNA_def_property(srna, "use_endroll_as_inroll", PROP_BOOLEAN, PROP_NONE);
     RNA_def_property_ui_text(
-        prop, "Inherit End Roll", "Use Roll Out of parent bone as Roll In of its children");
+        prop, "Inherit End Roll", "Add Roll Out of the Start Handle bone to the Roll In value");
     RNA_def_property_boolean_sdna(prop, NULL, "flag", BONE_ADD_PARENT_END_ROLL);
-    RNA_def_property_update(prop, 0, "rna_Armature_update_data");
+    RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+    RNA_def_property_update(prop, 0, "rna_Armature_dependency_update");
   }
 
   /* Curve X/Y Offsets */