As discussed with Hocuri.

There is still no property to check, if a user left a channel or not. That's why we always show "Leave channel" even if the user already left it.

This means also, that a user can not reenter the channel, which is something to be fixed in future imo. Setting the remove_timestamp in chats_contacts when leaving a channel could fix that.

api!(jsonrpc): removed ChatListItem.is_broadcast

api(jsonrpc): mark ChatListItem.is_group as deprecated

Note that these won't show up in the changelog if they are not in the title of a commit. Easiest solution is to squash merge and just call the commit api!: In ChatListItem, replace is_group and is_(out_)broadcast with chat_type property; I think this is specific enough, no need to say what is deprecated and what removed. Alternatively, you can prefix with BREAKING CHANGE as explained in https://github.com/chatmail/core/blob/main/CONTRIBUTING.md, or break it up into multiple commits which you rebase-merge.