only suggest types when completing from a library prefix in parameter list

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

Index: pkg/analysis_server/lib/src/services/completion/combinator_computer.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/combinator_computer.dart b/pkg/analysis_server/lib/src/services/completion/combinator_computer.dart
index 3da2f69a83dffa2a99283bc9e346a5c0a230c5d3..519383da390757978908cbf89e02340089330d71 100644
--- a/pkg/analysis_server/lib/src/services/completion/combinator_computer.dart
+++ b/pkg/analysis_server/lib/src/services/completion/combinator_computer.dart
@@ -71,7 +71,7 @@ class _CombinatorAstVisitor
 class _CombinatorSuggestionBuilder extends LibraryElementSuggestionBuilder {
   _CombinatorSuggestionBuilder(
       DartCompletionRequest request, CompletionSuggestionKind kind)
-      : super(request, kind);
+      : super(request, kind, false);
 
   Future<bool> execute(AstNode node) {
     var directive = node.getAncestor((parent) => parent is NamespaceDirective);