Describe the bug
The title text (aka mouse over text) starts with "undefined", e.g. "undefined This user can send messages in this groupchat". I think it's supposed to be the JID, but that's unavailable in semi-anonymous groupchats.

To Reproduce
Steps to reproduce the behavior:

1. Join a semi-anonymous room as a non-moderator
2. Point at someone in the participant list
3. Wait for

I cannot reproduce this with the default usage of botui : the issue appears only when botui is part of a larger VueJS app.

When a markdown image is inserted in a message, it is immediately hidden if another message is displayed after.

botui.message.add({
	content: 'Hello World'
});
botui.message.add({
	content: 'Here is a picture : ![](https://www.google.fr/images/branding/g