Fix analysis server to only send SERVER_STATUS when subscribed to.

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index abdd1e0f9ae0aa3f7e0e1a97d43bcc8c8ccf9b4a..4264fec049b412116bb304f90ae513f35fa08bbd 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -431,6 +431,10 @@ class AnalysisServer {
    * being performed or `null` if analysis is complete.
    */
   void sendStatusNotification(ServerOperation operation) {
+    // Only send status when subscribed.
+    if (!serverServices.contains(ServerService.STATUS)) {
+      return;
+    }
     // Only send status when it changes
     bool isAnalyzing = operation != null;
     if (statusAnalyzing == isAnalyzing) {