Change 890193 had a related patch set uploaded (by Dreamy Jazz; author: Dreamy Jazz):

[mediawiki/extensions/CheckUser@master] Specify word-wrap as anywhere to fix overflow into V22 page tools

https://gerrit.wikimedia.org/r/890193

Before this change

After this change

@Dreamy_Jazz It'd be helpful to also have a before after of an IPv6 address to see if the breaking is readable and clearly understandable.

Sure. I won't be able to publish the actual instance I saw this on enwiki (as it's private data) but let me see if I can get some test data on a local testing wiki simulate what I saw.

Before associated change (on a testing instance)

After associated change (on a testing instance)

Notes
I replaced the value for "User" with the IP. This only presents a problem if the user and IP are an IPv6 address. The IPv6 address used is the loopback address in the full form.

One thing I did note is that when this change is applied and the user / IP column does not have an IPv6 address, the user agent takes up too much space (as shown below). I've been trying to work out a fix, but min-width doesn't work on table elements....

Modified the solution slightly. Setting word-wrap: everywhere on just the IPs list fixes the problem without the unintended side effects of making some columns too small:

For reference on the associated change (as to whether T327334 solves the issue). Added the mw-parser-output class manually and the word-wrap definition from the Vector skin did not fix the issue:

Change 890193 merged by jenkins-bot:

[mediawiki/extensions/CheckUser@master] Fix summary table overflow over the page tools on Vector 2022

https://gerrit.wikimedia.org/r/890193