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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
the select-stream signal is registered with G_SIGNAL_RUN_CLEANUP,
so the default handler always runs at the end (returning TRUE).
unless I'm missing something this signal has never worked, maybe we could modify the "Since" annotation too, or add a warning