Issue 24612. Skip excluded folder during contexts creation.

pkg/analysis_server/lib/src/context_manager.dart

Index: pkg/analysis_server/lib/src/context_manager.dart
diff --git a/pkg/analysis_server/lib/src/context_manager.dart b/pkg/analysis_server/lib/src/context_manager.dart
index 805a7757530ed30b6f841e7e883e02efb2a28973..b3dbca7bbf210ee758e27abfceead5b652cc1e8b 100644
--- a/pkg/analysis_server/lib/src/context_manager.dart
+++ b/pkg/analysis_server/lib/src/context_manager.dart
@@ -895,7 +895,9 @@ class ContextManagerImpl implements ContextManager {
    */
   void _createContexts(
       ContextInfo parent, Folder folder, bool withPackageSpecOnly) {
-    if (folder.shortName.startsWith('.') || folder.shortName == 'packages') {
+    if (_isExcluded(folder.path) ||
+        folder.shortName.startsWith('.') ||
+        folder.shortName == 'packages') {
       return;
     }
     // Decide whether a context needs to be created for [folder] here, and if