If analysis is already complete, don't start it again in onFileAnalysisComplete().

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 e330d8fe00c05133ce422814e5db06ad7937ea08..088d2a60dfa4efc89a7580df43b82d6a9103d9e3 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -757,6 +757,10 @@ class AnalysisServer {
     if (context == null) {
       return null;
     }
+    // done if everything is already analyzed
+    if (isAnalysisComplete()) {
+      return new Future.value(AnalysisDoneReason.COMPLETE);
+    }
     // schedule context analysis
     schedulePerformAnalysisOperation(context);
     // associate with the context completer