This may be classed as a suggestion or unintended behaviour rather than a bug but I believe trade chat consists of the last 20 posts - but say if there were a couple of players that consistently spammed this reducing your visibility of chat trade to mostly just their posts and then you go and block/ignore them - your trade chat is now reduced to a handful of posts (ie 20 minus theirs). It doesn't actually help to make that channel more usable.

Expected outcome: If I block a player from chat - that shouldn't stop me from seeing other posts that might be actually applicable.