Constraints: add checks to specially handle the custom space target.

- The custom space target never needs B-Bone data (used by depsgraph).
- When drawing the relationship lines use the space matrix directly.
- Don't use the custom target to control the target space type dropdown.

Differential Revision: https://developer.blender.org/D9732

1 files changed, 5 insertions, 2 deletions

diff --git a/source/blender/blenkernel/intern/constraint.c b/source/blender/blenkernel/intern/constraint.c
index c32a6c6c515..0534899a86c 100644
--- a/source/blender/blenkernel/intern/constraint.c
+++ b/source/blender/blenkernel/intern/constraint.c
@@ -5844,9 +5844,12 @@ static bConstraint *add_new_constraint(Object *ob,
   return con;
 }
 
-bool BKE_constraint_target_uses_bbone(struct bConstraint *con,
-                                      struct bConstraintTarget *UNUSED(ct))
+bool BKE_constraint_target_uses_bbone(struct bConstraint *con, struct bConstraintTarget *ct)
 {
+  if (ct->flag & CONSTRAINT_TAR_CUSTOM_SPACE) {
+    return false;
+  }
+
   return (con->flag & CONSTRAINT_BBONE_SHAPE) || (con->type == CONSTRAINT_TYPE_ARMATURE);
 }