JS mode, regression bug because of fix for #936 (server hangs) fixed

app/src/processing/mode/javascript/JavaScriptEditor.java

@@ -381,11 +381,13 @@ public class JavaScriptEditor extends ServingEditor
 	{
 		statusEmpty();
 		
-		startServer( getExportFolder() );
+		if ( !startServer( getExportFolder() ) )
+		{
+			if ( !handleExport( false ) ) return;
+			toolbar.activate(JavaScriptToolbar.RUN);
+		}
 		
-		if ( !handleExport( false ) ) return;
-		
-		toolbar.activate(JavaScriptToolbar.RUN);
+		// waiting for server to call "serverStarted() below ..."
 	}
 
 	private void handleOpenInBrowser ()
@@ -515,6 +517,16 @@ public class JavaScriptEditor extends ServingEditor
                      null);
   }
 
+  // ------- server callbacks ----
+
+  public void serverStarted ()
+  {
+  		super.serverStarted();
+
+		if ( !handleExport( false ) ) return;
+		toolbar.activate(JavaScriptToolbar.RUN);
+  }
+
   // ------- utilities ---------
 
   private File getExportFolder ()

app/src/processing/mode/javascript/ServingEditor.java

@@ -130,7 +130,7 @@ public abstract class ServingEditor extends Editor implements BasicServerListene
 		return server;
 	}
 	
-	protected void startServer ( File root )
+	protected boolean startServer ( File root )
 	{
 		if ( server != null && 
 			 ( !server.isRunning() || !server.getRoot().equals(root) ) )
@@ -156,7 +156,11 @@ public abstract class ServingEditor extends Editor implements BasicServerListene
 			statusNotice( "Server running (" + 
 						  server.getAddress() +
 						  "), reload your browser window." );
+						
+			return false;
 		}
+		
+		return true;
 	}
 	
 	protected boolean serverRunning ()