This is related to issues #2356 - tags and mentions not linking in certain conditions when posting in markdown. I don't know how to fix this issue, but it is a pretty big problem for my instance so I decided to write some tests to help identify the problem.
This PR contains six new tests of the formatter which demonstrate three instances in which tags/mentions are linked properly (3 new passing tests), and three instances in which they are not (3 new failing tests).
I hope this is somehow helpful to solving this bug!
polarisera on Spinster has been doing some UI testing to try to help, too, and I believe that we're actually looking at two different problems.
- links not being applied to certain tags or mentions by linkify when passed HTML (#2356)
- certain hashtags being disappeared entirely (possibly before linkify even gets to it?) (#2376 (closed))
This PR just adds tests for the first problem - linkify not adding links in certain HTML conditions. I'll update if I manage to replicate the second problem in tests, too!