[Webkit-unassigned] [Bug 195667] New: unified plan: ice connection state goes to disconnected when adding a new m-line

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195667

            Bug ID: 195667
           Summary: unified plan: ice connection state goes to
                    disconnected when adding a new m-line
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: argggh at appear.in
                CC: youennf at gmail.com

Safari TP 77 seems to exhibit the same (incorrect) behavior as Chrome when adding new m-lines to an existing peer connection: https://bugs.chromium.org/p/chromium/issues/detail?id=909684

To Reproduce:
* Go to https://webrtc.github.io/samples/src/content/peerconnection/pc1/
* Make a call (having Develop -> Experimental Features -> WebRTC Unified Plan enabled)
* Paste into the console:
navigator.mediaDevices.getDisplayMedia({video: true}).then(stream => {
    pc1.addTrack(stream.getTracks()[0], stream);
    pc1.createOffer().then(offer => pc1.setLocalDescription(offer));
});

* Observe that console output indicates that ICE state goes to "disconnected"
* Repeat having Unified Plan disabled, observing that the same does not happen in this scenario.

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