[129/tts-refactor] now flip backwards if playing chunk on prev page - previously it would only flip forward if the chunk's leaf wasn't visible
[129/tts-refactor] now flip backwards if playing chunk on prev page
- previously it would only flip forward if the chunk's leaf wasn't visible

openlibrary/bookreader,internetarchive/bookreader,openlibrary/bookreader,openlibrary/bookreader,openlibrary/bookreader,internetarchive/bookreader,openlibrary/bookreader