Don't include *.yaml files in 'analysis.analyzedFiles' notification.

pkg/analysis_server/lib/src/operation/operation_analysis.dart

Index: pkg/analysis_server/lib/src/operation/operation_analysis.dart
diff --git a/pkg/analysis_server/lib/src/operation/operation_analysis.dart b/pkg/analysis_server/lib/src/operation/operation_analysis.dart
index a53200505c5ebbebe6c3c443322ace769b98b940..0b57104f3a5c6c22ead47c8e2265354cad423a4c 100644
--- a/pkg/analysis_server/lib/src/operation/operation_analysis.dart
+++ b/pkg/analysis_server/lib/src/operation/operation_analysis.dart
@@ -67,6 +67,11 @@ void sendAnalysisNotificationAnalyzedFiles(AnalysisServer server) {
         .map((driver) => driver.knownFiles)
         .expand((files) => files)
         .toSet();
+
+    // Exclude *.yaml files because IDEA Dart plugin attempts to index
+    // all the files in folders which contain analyzed files.
+    analyzedFiles.removeWhere((file) => file.endsWith('.yaml'));
+
     Set<String> prevAnalyzedFiles = server.prevAnalyzedFiles;
     if (prevAnalyzedFiles != null &&
         prevAnalyzedFiles.length == analyzedFiles.length &&