[Chris Janicki <chris.janicki@xxxxxxxxx>]

    Hi,
    
    I tried to create a gitlab account to enter this bug, but it refuses
    my credit card verification step.  Sorry for the email, but I wanted
    to report before I forget the details.
    
    The problem is simple: Changes to the SNMP Users Table are not
    accepted until "OK" is pressed, which can lead to a confusing error
    message.  For example:
    
    1. This is a valid users table.

    2. This is an error condition, because two user names are identical
    AND have the same authentication model.

    3. So I press Cancel then try again.  This time, I delete the second
    row.  Then I change the auth model to SHA1 (which had conflicted
    with the deleted row).  The error message appears again, and the
    "Duplicate key" message is now illogical/confusing, because there is
    only one row.

    Of course, the work-around is to delete the second row, then press
    OK (which closes the dialog), then go back in to change the auth
    model.  But this is not intuitive.  The "fix" is to have the dialog
    alter its copy of the original table during the editing session, so
    that data validation occurs on the contents of the displayed table.
    
    I hope that's helpful.  Thanks!