Previously (I’m 99% sure) if a topic was pinned and you scrolled down the title would appear in the header (as you can see in image 1) and you could press icon and it would pin/unpin. However it does not allow you to do this despite the pin still being clickable. In image 2 it works fine you can pin/unpin
I prefixed the commit with FEATURE because I couldn’t find anything in the codebase that suggested this worked before so the only way to “fix” this was to add support for it which means it’s a new feature
I also noticed that toggling the pin from topics lists wasn’t working here on Meta due to a theme component so I fixed that as well: