Emit 'terminated' event if PSES is restarted. (#2775)

Author: TylerLeonhardt

src/debugAdapter.ts

@@ -53,6 +53,7 @@ export class NamedPipeDebugAdapter implements DebugAdapter {
 
         // When the socket closes, end the session.
         this._debugServiceSocket.on("close", () => { this.dispose(); });
+        this._debugServiceSocket.on("end", () => { this.dispose(); });
     }
 
     public handleMessage(message: DebugProtocolMessage): void {
@@ -66,6 +67,7 @@ export class NamedPipeDebugAdapter implements DebugAdapter {
 
     public dispose() {
         this._debugServiceSocket.destroy();
+        this._sendMessage.fire({ type: 'event', event: 'terminated' });
         this._sendMessage.dispose();
     }