made DialogPicker content scrollable

lib/screens/settings/components/shared/dialog_picker/widget_dialog_picker.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/scheduler.dart';
 import 'package:lightmeter/generated/l10n.dart';
 import 'package:lightmeter/res/dimens.dart';
 
@@ -24,6 +25,24 @@ class DialogPicker<T> extends StatefulWidget {
 
 class _DialogPickerState<T> extends State<DialogPicker<T>> {
   late T _selected = widget.selectedValue;
+  final ScrollController _scrollController = ScrollController();
+
+  @override
+  void initState() {
+    super.initState();
+    SchedulerBinding.instance.addPostFrameCallback((_) {
+      final selectedIndex = widget.values.indexOf(_selected);
+      if (selectedIndex >= 0) {
+        _scrollController.jumpTo((Dimens.grid56 * selectedIndex).clamp(0, _scrollController.position.maxScrollExtent));
+      }
+    });
+  }
+
+  @override
+  void dispose() {
+    _scrollController.dispose();
+    super.dispose();
+  }
 
   @override
   Widget build(BuildContext context) {
@@ -34,6 +53,13 @@ class _DialogPickerState<T> extends State<DialogPicker<T>> {
       contentPadding: EdgeInsets.zero,
       content: SizedBox(
         width: double.maxFinite,
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            const Divider(),
+            Flexible(
+              child: SingleChildScrollView(
+                controller: _scrollController,
                 child: Column(
                   crossAxisAlignment: CrossAxisAlignment.stretch,
                   mainAxisSize: MainAxisSize.min,
@@ -55,6 +81,11 @@ class _DialogPickerState<T> extends State<DialogPicker<T>> {
                       .toList(),
                 ),
               ),
+            ),
+            const Divider(),
+          ],
+        ),
+      ),
       actionsPadding: Dimens.dialogActionsPadding,
       actions: [
         TextButton(