All unread messages are highlighted with a gray background. This is currently the same color used on mouse hover, simply because it was easy to copy. A channel is marked read when: * You switch channel (either via mouse or keyboard); or * you send a message. This means that new messages _from others in the channel_ will remain unread until you either: * send a message; or * change the current channel. Future improvements: * Add a keybinding to mark the channel read (easy-ish) * Mark a message as read as soon as it's received if the terminal window (and thus comlink itself) is focused (harder). * Mark a channel read on window focus (easy-ish). - This might actually not be nice? I wouldn't want a channel to be marked read as soon as I focus the window in case there's a long scrollback I want to catch up on.