(handle_stop): Initialize it->add_overlay_start to zero.
(handle_invisible_prop): Record the start of invisible text in it->add_overlay_start. (struct overlay_entry): Add member `overlay'. (handle_overlay_change): Simplify. (next_overlay_string): After having processed overlay strings at the end of the buffer, record that fact in it->overlay_strings_at_end_processed_p. (compare_overlay_entries): If before- and after-strings come from the same overlay, let before-strings come first. (RECORD_OVERLAY_STRING): Record the overlay that strings come from. (load_overlay_strings): Take it->add_overlay_start into account when adding overlay strings.
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