Give YaruTabbedPage index on rebuild

Fixes #159

example/lib/pages/tabbed_page_page.dart

@@ -4,11 +4,16 @@ import 'package:yaru_widgets/yaru_widgets.dart';
 import 'package:yaru_widgets_example/widgets/row_list.dart';
 
 class TabbedPagePage extends StatelessWidget {
-  const TabbedPagePage({Key? key}) : super(key: key);
+  const TabbedPagePage({
+    Key? key,
+    this.initialIndex = 0,
+  }) : super(key: key);
+
+  final int initialIndex;
 
   @override
   Widget build(BuildContext context) {
-    return YaruTabbedPage(views: [
+    return YaruTabbedPage(initialIndex: initialIndex, views: [
       YaruPage(
         children: [RowList()],
       ),

lib/src/yaru_tabbed_page.dart

@@ -17,6 +17,7 @@ class YaruTabbedPage extends StatefulWidget {
       right: kDefaultPagePadding,
       left: kDefaultPagePadding,
     ),
+    this.initialIndex = 0,
   }) : super(key: key);
 
   /// A list of [IconData] used inside the tabs - must have the same length as [tabTitles] and [views].
@@ -34,6 +35,9 @@ class YaruTabbedPage extends StatefulWidget {
   /// The padding [EdgeInsets] which defaults to [kDefaultPadding] at top, right and left.
   final EdgeInsets padding;
 
+  /// The initialIndex of the [TabController]
+  final int initialIndex;
+
   @override
   State<YaruTabbedPage> createState() => _YaruTabbedPageState();
 }
@@ -42,9 +46,15 @@ class _YaruTabbedPageState extends State<YaruTabbedPage>
     with TickerProviderStateMixin {
   late TabController tabController;
 
+  int _index = 0;
+
   @override
   void initState() {
-    tabController = TabController(length: widget.views.length, vsync: this);
+    tabController = TabController(
+      initialIndex: _index,
+      length: widget.views.length,
+      vsync: this,
+    );
     super.initState();
   }
 
@@ -91,6 +101,7 @@ class _YaruTabbedPageState extends State<YaruTabbedPage>
                   color:
                       Theme.of(context).colorScheme.onSurface.withOpacity(0.1),
                 ),
+                onTap: (index) => _index = index,
                 tabs: [
                   for (var i = 0; i < widget.views.length; i++)
                     Tab(