If the file belongs to any analysis root, check whether we're in it now.

pkg/analysis_server/lib/src/operation/operation_analysis.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library operation.analysis;
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/computer/computer_highlights.dart';
 import 'package:analysis_server/src/computer/computer_navigation.dart';
 import 'package:analysis_server/src/computer/computer_occurrences.dart';
@@ skipping 18 matching lines @@
   }
 }
 
 /**
  * Schedules sending notifications for the given [file] using the resolved
  * [resolvedDartUnit].
  */
 void scheduleNotificationOperations(AnalysisServer server, String file,
     LineInfo lineInfo, AnalysisContext context, CompilationUnit parsedDartUnit,
     CompilationUnit resolvedDartUnit, List<AnalysisError> errors) {
+  // If the file belongs to any analysis root, check whether we're in it now.
+  AnalysisContext containingContext = server.getContainingContext(file);
+  if (containingContext != null && context != containingContext) {
+    return;
+  }
   // Dart
   CompilationUnit dartUnit =
       resolvedDartUnit != null ? resolvedDartUnit : parsedDartUnit;
   if (resolvedDartUnit != null) {
     if (server.hasAnalysisSubscription(
         protocol.AnalysisService.HIGHLIGHTS, file)) {
       server.scheduleOperation(
           new _DartHighlightsOperation(context, file, resolvedDartUnit));
     }
     if (server.hasAnalysisSubscription(
@@ skipping 355 matching lines @@
 abstract class _SingleFileOperation extends SourceSensitiveOperation {
   final String file;
 
   _SingleFileOperation(AnalysisContext context, this.file) : super(context);
 
   @override
   bool shouldBeDiscardedOnSourceChange(Source source) {
     return source.fullName == file;
   }
 }