WEB-7148 Built In HTTP Preview Server Needed (IntelliJ IDEA)

platform/platform-api/src/org/jetbrains/ide/CustomPortServerManager.java

@@ -11,6 +11,8 @@ public abstract class CustomPortServerManager {
 
   public interface CustomPortService {
     boolean rebind();
+
+    boolean isBound();
   }
 
   public abstract int getPort();

platform/platform-impl/src/org/jetbrains/io/SubServer.java

@@ -37,6 +37,11 @@ public class SubServer implements CustomPortServerManager.CustomPortService, Dis
     }
   }
 
+  @Override
+  public boolean isBound() {
+    return !openChannels.isEmpty();
+  }
+
   private void stop() {
     // todo should we call releaseExternalResources? We use only 1 boss&worker thread
     openChannels.close().awaitUninterruptibly();