9d4db1d5dd
## Description This PR fixes SegmentedButton focus traversal. # Before When a focused segment (with no icon) is selected or unselected, the focus moves to another segment. [Capture vidéo du 2025-08-11 15-28-03.webm](https://github.com/user-attachments/assets/11c29194-6b96-4ea4-9245-dcbd36dc424f) In this recording, tab key is used to set the focus on 'Month' segment, then enter is used to select the segment. The focus move unexpectedly to 'Week' segment. # After When a focused segment (with no icon) is selected or unselected, the focus stays on this same segment and the InkWell animations are correctly painted. [Capture vidéo du 2025-08-11 15-27-30.webm](https://github.com/user-attachments/assets/e09056d0-b572-462b-8ad8-c23eddcc4bfd) <details><summary>Code sample for recordings</summary> ```dart import 'package:flutter/material.dart'; /// Flutter code sample for [SegmentedButton]. void main() { runApp(const SegmentedButtonApp()); } class SegmentedButtonApp extends StatelessWidget { const SegmentedButtonApp({super.key}); @override Widget build(BuildContext context) { return const MaterialApp( home: Scaffold(body: Center(child: SingleChoice())), ); } } enum Calendar { day, week, month, year } class SingleChoice extends StatefulWidget { const SingleChoice({super.key}); @override State<SingleChoice> createState() => _SingleChoiceState(); } class _SingleChoiceState extends State<SingleChoice> { Calendar calendarView = Calendar.day; @override Widget build(BuildContext context) { return SegmentedButton<Calendar>( segments: const <ButtonSegment<Calendar>>[ ButtonSegment<Calendar>(value: Calendar.day, label: Text('Day')), ButtonSegment<Calendar>(value: Calendar.week, label: Text('Week')), ButtonSegment<Calendar>(value: Calendar.month, label: Text('Month')), ButtonSegment<Calendar>(value: Calendar.year, label: Text('Year')), ], selected: <Calendar>{calendarView}, onSelectionChanged: (Set<Calendar> newSelection) { setState(() { // By default there is only a single segment that can be // selected at one time, so its value is always the first // item in the selected set. calendarView = newSelection.first; }); }, ); } } ``` </details> ## Related Issue Fixes [SegmentedButton keyboard navigation incorrectly moves focus on click](https://github.com/flutter/flutter/issues/161922) ## Implementation choice The root of this issue is TextButton.icon which creates a different widget tree depending on the icon. See https://github.com/flutter/flutter/issues/173944 for more context. The proposed solution is to maintain the same widget tree when possible. To do TextButton.icon is not used. This PR uses on TextButton and build a child containing both the icon (when present) and the label. In order to keep the same rendering as before, some internal logic from TextButton.icon is duplicated. ## Tests Adds 1 test. Updates 1 test.
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