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Merge neighbouring segments that can be converted to Text
and send them as one text message.

Using the syncing() reader will not call the callback if syncing
continuously fails [1]. We instead listen to the failed events
to determine whether we need to resume syncing.

[1]: https://gitlab.com/kazv/libkazv/-/commit/3652b27059910eaed0d1c95ff7807281eaba3f67