Ignore added files in hidden directories.

pkg/analysis_server/lib/src/context_manager.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 context.directory.manager;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:core' hide Resource;
@@ skipping 992 matching lines @@
     _instrumentationService.logWatchEvent(
         info.folder.path, event.path, event.type.toString());
     String path = event.path;
     // First handle changes that affect folderDisposition (since these need to
     // be processed regardless of whether they are part of an excluded/ignored
     // path).
     if (info.hasDependency(path)) {
       _recomputeFolderDisposition(info);
     }
     // maybe excluded globally
-    if (_isExcluded(path)) {
+    if (_isExcluded(path) || _isContainedInDotFolder(info.folder.path, path)) {
       return;
     }
     // maybe excluded from the context, so other context will handle it
     if (info.excludes(path)) {
       return;
     }
     if (info.ignored(path)) {
       return;
     }
     // handle the change
@@ skipping 115 matching lines @@
           callbacks.applyChangesToContext(info.folder, changeSet);
         }
         break;
     }
 
     //TODO(pquitslund): find the right place for this
     _checkForPackagespecUpdate(path, info, info.folder);
   }
 
   /**
+   * Determine whether the given [path], when interpreted relative to the
+   * context root [root], contains a folder whose name starts with '.'.
+   */
+  bool _isContainedInDotFolder(String root, String path) {
+    String relativePath =
+        pathContext.relative(pathContext.dirname(path), from: root);
+    for (String pathComponent in pathContext.split(relativePath)) {
+      if (pathComponent.startsWith('.') &&
+          pathComponent != '.' &&
+          pathComponent != '..') {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  /**
    * Returns `true` if the given [path] is excluded by [excludedPaths].
    */
   bool _isExcluded(String path) => _isExcludedBy(excludedPaths, path);
 
   /**
    * Returns `true` if the given [path] is excluded by [excludedPaths].
    */
   bool _isExcludedBy(List<String> excludedPaths, String path) {
     return excludedPaths.any((excludedPath) {
       if (pathContext.isWithin(excludedPath, path)) {
@@ skipping 245 matching lines @@
           var path = resourceProvider.pathContext.fromUri(uri);
           packageMap[name] = <Folder>[resourceProvider.getFolder(path)];
         }
       });
       return <UriResolver>[new SdkExtUriResolver(packageMap)];
     } else {
       return const <UriResolver>[];
     }
   }
 }