Fix line-dependent tests for formatting (#160389)

These tests are dependent on line numbers. This formats them and updates
the line number to take them off the critical path.

packages/flutter/test/widgets/semantics_tester_generate_test_semantics_expression_for_current_semantics_tree_test.dart

@@ -25,7 +25,8 @@ void _tests() {
   });
 
   Future<void> pumpTestWidget(WidgetTester tester) async {
-    await tester.pumpWidget(MaterialApp(
+    await tester.pumpWidget(
+      MaterialApp(
         home: ListView(
           children: <Widget>[
             const Text('Plain text'),
@@ -43,7 +44,8 @@ void _tests() {
             ),
           ],
         ),
-    ));
+      ),
+    );
   }
 
   // This test generates code using generateTestSemanticsExpressionForCurrentSemanticsTree
@@ -55,8 +57,11 @@ void _tests() {
   testWidgets('generates code', (WidgetTester tester) async {
     final SemanticsTester semantics = SemanticsTester(tester);
     await pumpTestWidget(tester);
-    final String code = semantics
-      .generateTestSemanticsExpressionForCurrentSemanticsTree(DebugSemanticsDumpOrder.inverseHitTest)
+    final String code =
+        semantics
+            .generateTestSemanticsExpressionForCurrentSemanticsTree(
+              DebugSemanticsDumpOrder.inverseHitTest,
+            )
             .split('\n')
             .map<String>((String line) => line.trim())
             .join('\n')
@@ -69,7 +74,10 @@ void _tests() {
           if (childSearch != null) {
             return childSearch;
           }
-        } else if (entity is File && entity.path.endsWith('semantics_tester_generate_test_semantics_expression_for_current_semantics_tree_test.dart')) {
+        } else if (entity is File &&
+            entity.path.endsWith(
+              'semantics_tester_generate_test_semantics_expression_for_current_semantics_tree_test.dart',
+            )) {
           return entity;
         }
       }
@@ -79,10 +87,9 @@ void _tests() {
     final File thisTestFile = findThisTestFile(Directory.current)!;
     expect(thisTestFile, isNotNull);
     String expectedCode = thisTestFile.readAsStringSync();
-    expectedCode = expectedCode.substring(
-      expectedCode.indexOf('v' * 12) + 12,
-      expectedCode.indexOf('^' * 12) - 3,
-    )
+    expectedCode =
+        expectedCode
+            .substring(expectedCode.indexOf('v' * 12) + 12, expectedCode.indexOf('^' * 12) - 3)
             .split('\n')
             .map<String>((String line) => line.trim())
             .join('\n')
@@ -102,6 +109,7 @@ void _tests() {
         // You must update it when changing the output generated by
         // generateTestSemanticsExpressionForCurrentSemanticsTree. Otherwise,
         // the test 'generates code', defined above, will fail.
+        // dart format off
         // vvvvvvvvvvvv
         TestSemantics.root(
           children: <TestSemantics>[
@@ -154,6 +162,7 @@ void _tests() {
           ],
         ),
         // ^^^^^^^^^^^^
+        // dart format on
         ignoreRect: true,
         ignoreTransform: true,
         ignoreId: true,