Update the menu label that adds IP to the investigation:
- Keep "Show all users on this IP" when there are other users who have made edits
- Change to "Add this IP to investigation" when there are no other users who have made edits (but might have other logged actions)
These labels set better expectations of what will happen on clicking.
In the Compare tab results table, if the number of edits for a User/IP/UA combinations matches the number of edits for all users, this implies that there are no more users on that IP. For example:
Arguably we should disable the "Show all users on this IP" button in this situation.
However, as a counter-argument, the check user might still want to add the IP to the investigation to see if any users performed any non-editing actions from that IP.