Kris 912b002dcc
UX: show strikethrough, underline in post edit diff (#30773)
Reported here:
https://meta.discourse.org/t/strike-through-text-is-not-rendered-in-diff/347101

`text-decoration: none` needs a few exceptions here to avoid stripping
out styling that's present in posts


before (strikethrough and underline stripped): 

![image](https://github.com/user-attachments/assets/ecb8cdee-e04b-463f-93a3-16d92797f0cd)


after: 

![image](https://github.com/user-attachments/assets/b250c535-de2f-429a-8764-5a60e74ef953)
2025-01-14 15:00:12 -05:00
..