Fix T58652: Crash editing shape keys weirdness with instances

This is a second attempt to get the crash fixed. The original fix
worked, but it was reverted by d3e0d7f0825.

Now the logic goes as:

- All pointers which we can not have shared (the ones which are
  owned by the runtime) are cleared.
- The rest of runtime stays untouched.

This seems to be enough to keep particles happy.

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/object.c b/source/blender/blenkernel/intern/object.c
index 498658765b6..921a3602c08 100644
--- a/source/blender/blenkernel/intern/object.c
+++ b/source/blender/blenkernel/intern/object.c
@@ -3582,6 +3582,17 @@ void BKE_object_runtime_reset(Object *object)
 	memset(&object->runtime, 0, sizeof(object->runtime));
 }
 
+/* Reset all pointers which we don't want to be shared when copying the object. */
+void BKE_object_runtime_reset_on_copy(Object *object)
+{
+	Object_Runtime *runtime = &object->runtime;
+	runtime->mesh_eval = NULL;
+	runtime->mesh_deform_eval = NULL;
+	runtime->curve_cache = NULL;
+	runtime->gpencil_cache = NULL;
+	runtime->cached_bbone_deformation = NULL;
+}
+
 /*
  * Find an associated Armature object
  */