Files are missing when a folder is moved during synchronization

1. Server: create a folder "A" under personal workspace. Pull several files into that folder. Wait for the folder and the files to sync down to local by Nuxeo Drive.
2. Server: create another folder "B" under personal workspace.
3. Client: wait for folder "B" to appear locally
4. Server: immediately after folder "B" appears locally, drag the folder "A" into folder "B". This has to be done before the next getChangeSummary call (meaning within 30 seconds or so)

Actual restult:

• Client: after the next getChangeSummary poll, folder "A" with the files under it will stay at the same location
• Client: an empty folder "A" will be created under folder "B".