[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3658: Rip out all code referring to IProgress

[Tahoe-LAFS]

#3658: Rip out all code referring to IProgress
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 Reporter:  itamarst  |          Owner:  itamarst
     Type:  defect    |         Status:  new
 Priority:  normal    |      Milestone:  Support Python 3
Component:  unknown   |        Version:  n/a
 Keywords:            |  Launchpad Bug:
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 1. The only IProgress implementation is PercentProgress.

 2. PercentProgress is never instantiated in the code base.

 So there's a whole bunch of code paths that are never used.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3658>
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