improvement: `AddICECandidate({ candidate: ""`

...after setting an offer.

I don't know how much it affects the behavior. Currently browser proxies send the a=ice-options:trickle line in the offer, indicating that they support ICE trickling, and since snowflake-webext@874e4ace the answer is not always sent with the a=end-of-candidates marker.

Related: snowflake-webext!63 (closed)