[analysis_server] Dot shorthands: Update AddConst fix to add const to dot shorthand constructor invocations.

The `AddConst` fix is triggered by the `PreferConstConstructors` lint and this CL updates the fix to add `const` to dot shorthand constructor invocations that can be made constant.

Fixes: #61163
Bug: #60994
Change-Id: I4520c1edf807c041f38f5477f48ab1b1327732b5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/441720
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Kallen Tu <[email protected]>

Author: kallentu

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

@@ -95,7 +95,12 @@ class AddConst extends ResolvedCorrectionProducer {
       await _insertBeforeNode(builder, targetNode);
       return;
     }
-    if (targetNode case InstanceCreationExpression(:var parent, :var keyword)) {
+    if (targetNode
+        case InstanceCreationExpression(:var parent, :var keyword) ||
+            DotShorthandConstructorInvocation(
+              :var parent,
+              constKeyword: var keyword,
+            )) {
       var constDeclarations =
           getCodeStyleOptions(unitResult.file).preferConstDeclarations;
 
@@ -110,7 +115,7 @@ class AddConst extends ResolvedCorrectionProducer {
           return;
         }
       }
-      if (keyword == null) {
+      if (keyword == null && targetNode is Expression) {
         await _insertBeforeNode(builder, targetNode);
         return;
       }

pkg/analysis_server/test/src/services/correction/fix/add_const_test.dart

@@ -626,6 +626,48 @@ class AddConst_PreferConstConstructorsTest extends FixProcessorLintTest {
   @override
   String get lintCode => LintNames.prefer_const_constructors;
 
+  Future<void> test_dotShorthand_named() async {
+    await resolveTestCode('''
+class C {
+  const C.named();
+}
+void f() {
+  C c = .named();
+  print(c);
+}
+''');
+    await assertHasFix('''
+class C {
+  const C.named();
+}
+void f() {
+  C c = const .named();
+  print(c);
+}
+''');
+  }
+
+  Future<void> test_dotShorthand_unnamed() async {
+    await resolveTestCode('''
+class C {
+  const C();
+}
+void f() {
+  C c = .new();
+  print(c);
+}
+''');
+    await assertHasFix('''
+class C {
+  const C();
+}
+void f() {
+  C c = const .new();
+  print(c);
+}
+''');
+  }
+
   Future<void> test_final_variable() async {
     createAnalysisOptionsFile(
       lints: [