Kathleen Brade authored Apr 10, 2019 and Georg Koppen committed May 03, 2019

When operating as a client and there is no network activity for
24 hours, tor 0.4.x will enter a dormant mode. Since most people
who start Tor Browser expect to use it right way, and since
bootstrapping won't occur when tor is dormant, we added the following
to torrc-defaults to ensure that tor leaves dormant mode:
  DormantCanceledByStartup 1