Face-to-face: the same room has different titles in each home (A omits the other member) #172

Found in UI test on main 8020074.

• A: Face-to-face · UiA1415 · Oct 17 14:38
• B: Face-to-face · UiA1415, UiB1415 · Oct 17 14:38

The title built from members should be the same for every participant (follow-up to #132 which made repeat rooms distinguishable). A should list both members, in the same order as B.