[Webkit-unassigned] [Bug 208373] New: addTrack doesn't fire onnegotiationneeded event

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=208373

            Bug ID: 208373
           Summary: addTrack doesn't fire onnegotiationneeded event
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bogdanostojic1993 at gmail.com
                CC: youennf at gmail.com

Both Participants are on Desktop.

Participant A: 
- OS: MacOS version 10.15.3
- Browser: Safari version 13.0.5

Participant B: 
- OS: Windows 10 Pro N version 1903
- Browser: Chrome version 80.0.3987.122

Participant A has onnegotationneeded event defined as: 

async function negotiate(e) {
  let offer;
  offer = await pc.createOffer();
  await pc.setLocalDescription(offer);
  //send offer to remote with websocket
}

If participant A creates a offer with audio only stream, and remote participant B creates an answer with audio only stream also, the connection is established.
After Participant A adds a video stream with RTCPeerConnection.addTrack(), participant B's RTCPeerConnection.ontrack event doesn't fire.
Also Participant A doesn't fire onnegotationneeded event, if I manually call RTCPeerConnection.createOffer() after calling addTrack, remote participant B's ontrack event fires.

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