Find drivers even when the file is not a dart file

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 2aa397217174f174bd4705cd595a718006d094cb..ec1d96b1ed928055cd2c7aaf29168c35f24668ca 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -689,7 +689,7 @@ class AnalysisServer {
     Iterable<nd.AnalysisDriver> drivers = driverMap.values;
     if (drivers.isNotEmpty) {
       nd.AnalysisDriver driver = drivers.firstWhere(
-          (driver) => driver.addedFiles.contains(path),
+          (driver) => driver.contextRoot.containsFile(path),
           orElse: () => null);
       driver ??= drivers.firstWhere(
           (driver) => driver.knownFiles.contains(path),