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Bug: when disk space is low, if the user clicked 'Cancel' the app would join a thread that never exited and therefore never close. Properly handle this case (set error and reset thread guards).
Weird behavior: the UI wasn't fully initialized before trying to connect to the server, so the user saw an incomplete dialog if connection wasn't instantaneous. Add a parameter to the UI update function and call it before attempting to connect so an appropriate message is displayed.