[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2551: Magic Folder: implement "Fire Dragons" section of design doc

[Tahoe-LAFS]

#2551: Magic Folder: implement "Fire Dragons" section of design doc
-------------------------------------+-------------------------------------
     Reporter:  dawuud               |      Owner:  daira
         Type:  enhancement          |     Status:  assigned
     Priority:  normal               |  Milestone:  undecided
    Component:  code-frontend-       |    Version:  1.10.1
  magic-folder                       |   Keywords:  remote conflict
   Resolution:                       |  detection review-needed
Launchpad Bug:                       |
-------------------------------------+-------------------------------------

Comment (by dawuud):

 after pairing with Daira today we fixed the conflict detection...
 this here dev branch is a continuation of that effort;
 here i've fixed the remote conflict detection:

 - teach Uploader to set the dmd metadata's last_downloaded_uri to
 db_entry.last_uploaded_uri
 - teach Downloader to call did_upload_version properly and set
 last_uploaded_uri to filecap and set last_downloaded_uri to
 last_uploaded_uri
 - fix Downloader remote conflict detection:
  - conflict "2a" is triggered appropriately for deletion versus
 modification
  - conflict "2cii" and "2ciii" shall not be triggered when the version is
 zero

 here:
 https://github.com/david415/tahoe-lafs/tree/2551.wip.2

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2551#comment:19>
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