https://github.com/w3c/mediacapture-main/pull/376 The User Agent MAY fire just a single event when several devices are added at the same time, e.g. a camera with a microphone.
There are some limitation on OSX to support this. When I plug in my Logitec webcam, AVfoundation only fire two plugin events without more detail. It doesn't indicate the two events are from the same hardware or not. It means I can't distinguish the case user plug in a webcam with cam & mic from the case user plug in 2 USB cameras in the same time. Currently the only solution comes to my mind is to use a timer, to filter out the 2nd events which arrives after the 1st one within X ms. But there will be some overkill. It is also a problem about the magic number we set to X.
Mass change P2->P3 to align with new Mozilla triage process.
Priority: P2 → P3
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