(init_from_display_pos): Don't set it->method and

overlay_string_index after pop_it.  Add asserts.
(handle_stop): Look for overlay strings around a display string,
image, or composition.  Handle properties on those strings.
(next_overlay_string): Don't set string, pos or method after pop_it.
(get_overlay_strings_1): Split from get_overlay_strings; don't
modify it if no overlay strings are found.
(get_overlay_strings): Use get_overlay_strings_1.  Always set
it->string and it->method.
(push_it): Push it->image_id and it->method.  Push it->object
instead of it->string if method is GET_FROM_IMAGE.
(pop_it): Pop it->image_id and it->method.  Ppo it->object
instead of it->string if method is GET_FROM_IMAGE.
Reset it->current.string_pos if popped it->string is nil.
(reseat_1): Remove comment dated 19 May 2003.  It expressed doubt
whether a given change was correct; but the change is correct.
Clear it->string_from_display_prop_p.
(set_iterator_to_next): Rely on it->method and it->image_id from
iterator stack, instead of setting them explicitly after pop_it.

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