The idmap_hash config needs to be validated and documentation improved.
Patch will follow.
Created attachment 13014 [details]
patch for 4.6
Created attachment 13015 [details]
Update for WHATSNEW.txt
Re-assigning to Karolin for inclusion in 4.6.next.
Pushed to autobuild-v4-6-test.
(In reply to Karolin Seeger from comment #4)
Pushed to v4-6-test.
Closing out bug report.