Fix notifications for nested packages

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 0cdc57c0e4c2baf11eac2585dbb8e6e1a5af4218..5347e14c97a5ee2771e9a6c4a20f00b154a8550c 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -368,11 +368,19 @@ class AnalysisServer {
    */
   AnalysisContext getAnalysisContext(String path) {
     // try to find a containing context
+    Folder containingFolder = null;
     for (Folder folder in folderMap.keys) {
       if (folder.path == path || folder.contains(path)) {
-        return folderMap[folder];
+        if (containingFolder == null) {
+          containingFolder = folder;
+        } else if (containingFolder.path.length < folder.path.length) {
+          containingFolder = folder;
+        }
       }
     }
+    if (containingFolder != null) {
+      return folderMap[containingFolder];
+    }
     Resource resource = resourceProvider.getResource(path);
     if (resource is Folder) {
       return null;