Thank you for this!

Out of curiosity, why does the suppression not work the same way anymore? I like that the suppression works for each check in the exact same way, now I have to remember that it works differently for this specific check. Or is the style of suppressing that I'm using going to be deprecated?

LineLength changed his parent from TreeWalker to Checker. This allows to use this Check on non java files( all Checks that located under Checker are not aware of AST of file they validate), as validation is super easy, just count character in line.
But there was a side effect: as Check change its parent module, filters/suppression module are changing also. Now LineLength can use filters only of Checker, so you see in diff new filter SuppressWithPlainTextCommentFilter. Unfortunately for now such filter does not support influenceFormat.
SuppressWithNearbyCommentFilter is filter for TreeWalker, that is AST aware filter, and it has influenceFormat.

We need to extend SuppressWithPlainTextCommentFilter to support influenceFormat checkstyle/checkstyle#7064

So if I understand you correctly, SuppressWithNearbyCommentFilter already didn't work for many of the checks? And the new issue you opened will add the ability to SuppressWithPlainTextCommentFilter to have (more or less) the same behavior as SuppressWithNearbyCommentFilter?

SuppressWithNearbyCommentFilter already didn't work for many of the checks?

Yes, as it works for Checks that validate any text file type ( not only java). Check was moved to more general area of validation, and unfortunately corresponding filter in such area has less functionality.

And the new issue you opened will add the ability

Yes

OK, I understand now. Thanks for taking the time to explain it to me, and also thanks for making the PR in the first place! I appreciate it.