"..." shown as username for users without a display name

Many of my less technical contacts have no display name. I'm not sure how they managed to do that - I'm guessing an earlier version of riot-web or riot-android allowed you to register with a blank display name (nowadays they appear to use your username if you leave the display name field blank).

The earlier Riot clients defaulted to showing the full username (@user:home.srv) whenever a user's display name was missing, however RiotX shows "..." instead, probably because there's no room to show the entire room ID.
This can be quite confusing when looking at your chat overview, as the only way to distinguish the conversations is by looking at their pictures.

Might be related to #1207.