Release v3.20.0-beta.2 (#1852)

Improvements for all users:

• We've found out that the synchronization process could be started more than
  once. Although this should have no effect (i.e. one start replacing the
  previous one) we've made sure we only start the process once. This should
  avoid wasting some resources in an extraneous start.
• In some situations, when moving a file or folder and overwriting an existing
  document, the local file system can fire a move event without firing a
  deletion event for the document that's being overwritten. We were very
  conservative in the way to we treat changes that could erase content so we
  would generate a conflict for those moves.
  Now that we have file versioning on the Cozy, we feel comfortable accepting
  those changes and will thus delete the overwritten document but will keep its
  existing references (e.g. photos album, bills…) and add them to the document
  being moved.

Improvements for Windows and macOS users:

• To avoid synchronizing temporary documents generated by some software when
  saving a new version of a document, we maintain a list of file name patterns
  that should not be synchronized. We had some patterns for the Microsoft Office
  suite files but we did not account for temporary files generated for all the
  file types those can open like Open Documents.
  We've enlarged the pattern used to match those files those that all temporary
  files created by the MS Office software should be matched and thus not be
  synchronized.

Improvements for Windows users:

• We've got reports from users experiencing app crashes. In at least some of
  those cases, the anti-virus seems to be involved.
  We've implemented some mitigations as found in the Electron documentation and
  hope to see those issues resolved.

See also known issues.

Happy syncing!