[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2537: magic-folder: implement download retry

[Tahoe-LAFS]

#2537: magic-folder: implement download retry
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     Reporter:  dawuud               |      Owner:  daira
         Type:  defect               |     Status:  new
     Priority:  normal               |  Milestone:  undecided
    Component:  code-frontend-       |    Version:  1.10.1
  magic-folder                       |   Keywords:  magic-folder download
   Resolution:                       |  downloader retry reliability
Launchpad Bug:                       |
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Comment (by dawuud):

 this unit test and feature now work properly thanks to Daira and Meejah.
 here's the latest:
 https://github.com/tahoe-lafs/tahoe-lafs/commits/2537.download-retry.5

 I presume we shall not close this ticket until we have merged Meejah's
 inline-callback-deque changeset into a stable branch. Once we've done that
 we can merge in this unit test and close this ticket as well as https
 ://tahoe-lafs.org/trac/tahoe-lafs/ticket/2412

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2537#comment:16>
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