So Slack keeps bugging me with “unread” message in a workspace. If I try to locate it it turns out it already deleted it because it “doesn’t support full history”. So it wants me to read a message that it can’t display. Ok. There’s a convenient “Mark as read” button. That one does nothing, because, guess what, it can’t mark invisible messages as read. Ok. Just close that chat maybe? Nah, you can’t close it because it has (1) bubble in place where close button would normally go. And close is nowhere in on multiple chat context menus. The only winning move is not to play.