Add assist to reparent Flutter widget

pkg/analysis_server/lib/src/services/correction/assist.dart

Index: pkg/analysis_server/lib/src/services/correction/assist.dart
diff --git a/pkg/analysis_server/lib/src/services/correction/assist.dart b/pkg/analysis_server/lib/src/services/correction/assist.dart
index a1a5387887f19362a2d61aabf1bd8cbed39562ff..60fb220ebc05478dfaa8799564221b1016fa3f76 100644
--- a/pkg/analysis_server/lib/src/services/correction/assist.dart
+++ b/pkg/analysis_server/lib/src/services/correction/assist.dart
@@ -119,6 +119,8 @@ class DartAssistKind {
       "Join 'if' statement with outer 'if' statement");
   static const JOIN_VARIABLE_DECLARATION = const AssistKind(
       'JOIN_VARIABLE_DECLARATION', 30, "Join variable declaration");
+  static const REPARENT_FLUTTER_WIDGET = const AssistKind(
+      "REPARENT_FLUTTER_WIDGET", 30, "Wrap new-expression with new widget");
   static const REMOVE_TYPE_ANNOTATION =
       const AssistKind('REMOVE_TYPE_ANNOTATION', 29, "Remove type annotation");
   static const REPLACE_CONDITIONAL_WITH_IF_ELSE = const AssistKind(