Trigger reconnect on Publisher PC disconnect also (#105)

* impl

* clean up _hasPublished

lib/src/core/engine.dart

@@ -139,6 +139,7 @@ class Engine extends Disposable with EventsEmittable<EngineEvent> {
 
     await publisher?.dispose();
     publisher = null;
+    _hasPublished = false;
 
     await subscriber?.dispose();
     subscriber = null;
@@ -367,11 +368,11 @@ class Engine extends Disposable with EventsEmittable<EngineEvent> {
             ));
 
     events.on<EnginePeerStateUpdatedEvent>((event) {
-      // only listen to primary ice events
-      if (!event.isPrimary) return;
+      //
+      final isPrimaryOrPublisher = event.isPrimary ||
+          (_hasPublished && event is EnginePublisherPeerStateUpdatedEvent);
 
-      if (event.state ==
-          rtc.RTCPeerConnectionState.RTCPeerConnectionStateFailed) {
+      if (isPrimaryOrPublisher && event.state.isDisconnectedOrFailed()) {
         // trigger reconnect sequence
         _onDisconnected(DisconnectReason.peerConnection);
       }

lib/src/extensions.dart

@@ -77,6 +77,11 @@ extension RTCIceCandidateExt on rtc.RTCIceCandidate {
 extension RTCPeerConnectionStateExt on rtc.RTCPeerConnectionState {
   bool isConnected() =>
       this == rtc.RTCPeerConnectionState.RTCPeerConnectionStateConnected;
+
+  bool isDisconnectedOrFailed() => [
+        rtc.RTCPeerConnectionState.RTCPeerConnectionStateDisconnected,
+        rtc.RTCPeerConnectionState.RTCPeerConnectionStateFailed,
+      ].contains(this);
 }
 
 extension RTCIceTransportPolicyExt on RTCIceTransportPolicy {