Summary

If user2's current username is the same as user1's old username, granting a permission to user2 through Single user will incorrectly show that user1 has been granted the permission.

This is a more problematic version of JRASERVER-65115

Steps to Reproduce

1. Create 2 users in Internal directory as follows:

   username	Display Name
   user1	User 1
   user2	User 2

2. Edit a Permission Scheme -> grant user2 a permission through Single user option
    Notice that User 2 is displayed
3. Rename user1 to user123
4. Rename user2 to user1

Expected Behavior

The Permission Scheme still displays User 2 as having the permission

Actual Behavior

The Permission Scheme now displays User 1 as having the permission

Impacts

 There's no functionality impact because the permission is still granted correctly to user2 (User 2) who now has the username of user1. This can be verified by using Permission helper.

 In other words, this is only a visual bug, but it may cause a lot of confusion to JIRA and/or Project administrators.

Notes

This issue usually manifests when:

1. Multiple user directories are used and 1 or more users exist in more than 1 directory
2. Users have been renamed mostly for user migration purposes across user directories

In JIRA db, table app_user looks somewhat like this:

and table cwd_user now looks somewhat like this:

Table schemepermissions shows that the permission is granted correctly to User 2: