Comment 13 for bug 393366

So I believe the bug is in knit._get_remaining_record_stream() around this point:
        if include_delta_closure:
            # XXX: get_content_maps performs its own index queries; allow state
            # to be passed in.
            non_local_keys = needed_from_fallback - absent_keys
            for keys, non_local_keys in self._group_keys_for_io(present_keys,
                                                                non_local_keys,
                                                                positions):
                generator = _VFContentMapGenerator(self, keys, non_local_keys,
                                                   global_map)
                for record in generator.get_record_stream():
                    yield record

Namely, if "include_delta_closure=True" it ignores the source_keys grouping that had just been set up.

Which is why we have the problem in *simple_annotate* which wants fulltexts, and not elsewhere. I'll see what I can set up.