87adaf3fe9
- Clarify comment about RenderObjectWrapper. - Assert that we never sync a RenderObjectWrapper with an instance of a different type. - Assert that MultiChildRenderObjectWrapper subclasses always have multi-child RenderObjects. - Assert that renderObject doesn't change identity when syncing. - Make searchForOldNode() return void since the return value is ignored. - Remove code that handled renderObject changing during sync.