Doesn't seem to work with Fruux / SoGo Connector Noté 1 sur 5 étoiles

Looks good, but doesn't seem to correctly remove duplicate contacts when contacts are being accessed from a remote addressbook via Fruux (SoGo Connector). As this was the reason for downloding/trying this add-on, unfortunately it didn't work for my use-case.

FWIW manually deleting from this 'remote addressbook' works fine, and the addon deletes locally but somehow when I re-synchronise, the deleted contacts re-appear.

I would be happy to re-test, dear developer, if you make some changes to address this problem.