suggest "this." local fields in constructor param

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

Index: pkg/analysis_server/lib/src/services/completion/optype.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/optype.dart b/pkg/analysis_server/lib/src/services/completion/optype.dart
index 84bced9c89d898f7edcbd0e2c74ba87817c6e4f5..e9391126764d213054b38285a131bc9c4ad50af5 100644
--- a/pkg/analysis_server/lib/src/services/completion/optype.dart
+++ b/pkg/analysis_server/lib/src/services/completion/optype.dart
@@ -442,6 +442,16 @@ class _OpTypeAstVisitor extends GeneralizingAstVisitor {
   }
 
   @override
+  void visitFieldFormalParameter(FieldFormalParameter node) {
+    if (entity == node.identifier) {
+      optype.isPrefixed = true;
+    } else {
+      optype.includeReturnValueSuggestions = true;
+      optype.includeTypeNameSuggestions = true;
+    }
+  }
+
+  @override
   void visitNormalFormalParameter(NormalFormalParameter node) {
     optype.includeReturnValueSuggestions = true;
     optype.includeTypeNameSuggestions = true;