==== What is the problem?
I cannot add a new username or IP to an existing investigation.
(Using "Show all IPs of this user" or "Show all users on this IP".)
It submits the form, but `targets` is blank.
I think because it gets the username/IP from the `data-cuc_user_text`/`data-cuc_ip` fields (resp.), but they don't exist anymore since T259106.
==== Steps to reproduce problem
1. Launch a new investigation
2. Hover over the tool menu and click "Show all IPs of this user" or "Show all users on this IP"
**Expected behavior:** Page refreshes, the username or IP chosen in step 2 is added to the investigation
**Observed behavior:** Page refreshes, but investigation stays the same
==== Environment
**Wiki(s):** Local vagrant: MediaWiki 1.36.0-alpha (004012c), CheckUser 2.5 (9ec06d4)
===== Notes
This also affects tool links (e.g. URLs are now like `https://www.dnsstuff.com/tools/tracert.ch?ip=`, with no IP). I can raise a separate bug if needs be. It does **not** appear to affect filters.