[webrtc-pc] Cannot create offer after stop transceiver (#2638)

medved276 has just created a new issue for https://github.com/w3c/webrtc-pc:

== Cannot create offer after stop transceiver ==
I use peerConnection with some transceivers.
When I stop 2 of them...
`pc.getTransceivers()[0].stop()
`
...I try to createOffer at some moment.
But I got
`Failed to execute 'setLocalDescription' on 'RTCPeerConnection': Failed to set local offer sdp: The m= section with mid='2' should be rejected.`
What incorrect?


Please view or discuss this issue at https://github.com/w3c/webrtc-pc/issues/2638 using your GitHub account


-- 
Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-config