The content of a ignored user's message is visible if someone quotes their message that is the quote of an ignored user is not ignored. It's a bit of a weird system, I would prefer if the quote of ignored users shows the same message as you see in the their original post, ie "The user is currently ignored".
Yeah, Jet seems to have a suggestion from another forum that would fix this problem for them. I'm torn about the suggestion and feel like there might be an easier way to implement this, programming-wise and without disruption to way things are already done.
Another forum that I have joined shortens quotes, and adds a "click to expand" button at the bottom of the shortened quote.
This would be very helpful, but I can already hear the users complaining about how this makes regular usage of the forum a tad bit more tedious.
If the quote author == a user on your ignore list then it should just apply "This user is currently ignored" message to their quote. Obviously this wouldn't work if it is a quote written without an author (quotes don't actually quote the message, and you can make it say anything, which is why it probably isn't ignored by default), but where it can be determined that the quote author is written in, and they are on your ignore list; it would seem to be one or two lines of code to clean this up.