Merge branch 'blender-v4.5-release'

source/blender/blenkernel/intern/anim_sys.cc

@@ -4235,6 +4235,13 @@ void BKE_animsys_eval_driver(Depsgraph *depsgraph, ID *id, int driver_index, FCu
     fcu = static_cast<FCurve *>(BLI_findlink(&adt->drivers, driver_index));
   }
 
+  if (!fcu) {
+    /* Trying to evaluate a driver that does no longer exist. Potentially missing a call to
+     * DEG_relations_tag_update. */
+    BLI_assert_unreachable();
+    return;
+  }
+
   DEG_debug_print_eval_subdata_index(
       depsgraph, __func__, id->name, id, "fcu", fcu->rna_path, fcu, fcu->array_index);
 

source/blender/makesrna/intern/rna_pose.cc

@@ -398,6 +398,7 @@ static void rna_PoseChannel_constraints_remove(
   con_ptr->invalidate();
 
   blender::ed::object::constraint_update(bmain, ob);
+  DEG_relations_tag_update(bmain);
 
   /* XXX(@ideasman42): is this really needed? */
   BKE_constraints_active_set(&pchan->constraints, nullptr);

tests/python/bl_animation_drivers.py

@@ -236,6 +236,11 @@ class SubDataDriverRemovalTest(AbstractEmptyDriverTest, unittest.TestCase):
         self.assertEqual(len(pose_bone.constraints), 1)
         arm_ob.driver_add('pose.bones["test"].constraints["test"].distance')
         self.assertEqual(len(arm_ob.animation_data.drivers), 1)
+
+        # To do a proper test, the depsgraph needs to be evaluated between adding
+        # the data and removing it. This causes depsgraph nodes to be built, which
+        # have to be removed as well. See #141243
+        bpy.context.evaluated_depsgraph_get()
         pose_bone.constraints.remove(constraint)
         self.assertEqual(len(pose_bone.constraints), 0)
         self.assertEqual(len(arm_ob.animation_data.drivers), 0,