show only named argument suggestions - fixes #25198, fixes #23992

pkg/analysis_server/lib/src/services/completion/dart/keyword_contributor.dart

Index: pkg/analysis_server/lib/src/services/completion/dart/keyword_contributor.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/dart/keyword_contributor.dart b/pkg/analysis_server/lib/src/services/completion/dart/keyword_contributor.dart
index 019c1ea1af61c6ec179a7aec62a16438deb59c6e..5ba7fa1c599bc6151fa5f91b3c4aad22b5bb2ed1 100644
--- a/pkg/analysis_server/lib/src/services/completion/dart/keyword_contributor.dart
+++ b/pkg/analysis_server/lib/src/services/completion/dart/keyword_contributor.dart
@@ -13,6 +13,8 @@ import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/src/dart/ast/token.dart';
+import 'package:analysis_server/src/services/completion/dart/completion_manager.dart';
+import 'package:analysis_server/src/services/completion/dart/optype.dart';
 
 const ASYNC = 'async';
 const ASYNC_STAR = 'async*';
@@ -50,6 +52,13 @@ class _KeywordVisitor extends GeneralizingAstVisitor {
 
   @override
   visitArgumentList(ArgumentList node) {
+    if (request is DartCompletionRequestImpl) {
+      //TODO(danrubel) consider adding opType to the API then remove this cast
+      OpType opType = (request as DartCompletionRequestImpl).opType;
+      if (opType.includeOnlyNamedArgumentSuggestions) {
+        return;
+      }
+    }
     if (entity == node.rightParenthesis) {
       _addExpressionKeywords(node);
       Token previous = (entity as Token).previous;