Support for replacing of the context folder.

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 6bda5f9eb023a1c6639ed9955ec09dfcc1b8acea..6e8e9f896e0e39628e1589ebce14aa8e0a74489d 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -1583,6 +1583,13 @@ class ServerContextManagerCallbacks extends ContextManagerCallbacks {
       analysisServer._computingPackageMap(computing);
 
   @override
+  void moveContext(Folder from, Folder to) {
+    // There is nothing to do.
+    // This method is mostly for tests.
+    // Context managers manage folders and contexts themselves.
+  }
+
+  @override
   void removeContext(Folder folder, List<String> flushedFiles) {
     AnalysisContext context = analysisServer.folderMap.remove(folder);
     sendAnalysisNotificationFlushResults(analysisServer, flushedFiles);