Fix for completion inside late final fields

[email protected]

Fixes #56936

Change-Id: Ib1a5ca0c27df2d19bca36f7385c30b02811c2e33
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/393043
Auto-Submit: Felipe Morschel <[email protected]>
Reviewed-by: Samuel Rawlins <[email protected]>
Commit-Queue: Brian Wilkerson <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>

Author: FMorschel

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

@@ -3940,6 +3940,9 @@ extension on AstNode {
       } else if (enclosingMember is FunctionBody &&
           enclosingMember.parent is ConstructorDeclaration) {
         return false;
+      } else if (enclosingMember is VariableDeclarationList &&
+          enclosingMember.parent is FieldDeclaration) {
+        return !enclosingMember.isLate;
       }
       enclosingMember = enclosingMember.parent;
     }

pkg/analysis_server/test/lsp/completion_dart_test.dart

@@ -2179,6 +2179,29 @@ import 'dart:^';
     expect(item.insertTextMode, isNull);
   }
 
+  Future<void> test_inside_lateFinal() async {
+    await checkCompleteFunctionCallInsertText('''
+class MyClass {
+  String get myGetter => '';
+  late final myField = [!myG^!]
+}
+''', 'myGetter', editText: 'myGetter');
+  }
+
+  Future<void> test_inside_nonLateFinal() async {
+    var content = '''
+class MyClass {
+  String get myGetter => '';
+  final myField = myG^
+}
+''';
+    await initialize();
+    var code = TestCode.parse(content);
+    await openFile(mainFileUri, code.code);
+    var res = await getCompletion(mainFileUri, code.position.position);
+    expect(res, isEmpty);
+  }
+
   Future<void> test_insideString() async {
     var content = '''
     var a = "This is ^a test"