The branch 4.0/add-existing-principal-in-admin-rights-ui was deleted and repushed:
was 2b7f82353ba5a32e56e5127843de2c4e900cf30b
now 98a1caa1e67f61f8b061015b76661a9dbb6d004e
1: 2b7f823 = 1: 98a1caa goto existing principal link directly if the principal is selected in "ADD USER" or "ADD GROUP"