If I understand Zulip's threading correctly (I can't log in right now to check), it imposes a strict two-level threading system. Quill (https://quill.chat http

If I understand Zulip's threading correctly (I can't log in right now to check), it imposes a strict two-level threading system. Quill (https://quill.chat https://quill.chat) has nested channels but unlike Zulip, clicking on the "outer" channels doesn't show you all the content of all the "innner" channels.