Right now the information that a topic is marked as solved is displayed below the first post and below the “Solution” post.
It would be great if this would also be visible in the fixed header of the topic that you see all the time, so you always know the topic you are looking at is already solved.
OK, I get the concern. (I didn’t think about these other, related cases)
Although I think for most (>95%?) uses I think it would never go >2 icons, I don’t see a reason that would make it unbearable. I actually think having the exact same icons as in the topic list would be very consistent.