If I (Dave) say: ..party @Jenna @Martin, it should fail, with a message explaining that I can't make a party with people who are already in other parties. This is the current behavior and correct.
BUT
If I say ..party @Jenna, it should allow me to join the party that Jenna is in (with Miko).
If I say ..party @Martin @Tobi, it should allow me to join the party with Martin and Tobi, because all the people I specified share the same party.
Let's say:
If I (Dave) say:
..party @Jenna @Martin, it should fail, with a message explaining that I can't make a party with people who are already in other parties. This is the current behavior and correct.BUT
If I say
..party @Jenna, it should allow me to join the party that Jenna is in (with Miko). If I say..party @Martin @Tobi, it should allow me to join the party with Martin and Tobi, because all the people I specified share the same party.