fix(libraries): stabilize alpha and sort controls

lib/utils/scroll_utils.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/widgets.dart';
 
 /// Scroll the nearest scrollable ancestor so [context] is centered.
@@ -7,13 +9,15 @@ import 'package:flutter/widgets.dart';
 void scrollContextToCenter(BuildContext? context) {
   if (context == null) return;
   WidgetsBinding.instance.addPostFrameCallback((_) {
-    if (!context.mounted) return;
-    Scrollable.ensureVisible(
-      context,
-      alignment: 0.5,
-      duration: const Duration(milliseconds: 200),
-      curve: Curves.easeOut,
-    );
+    Timer.run(() {
+      if (!context.mounted) return;
+      Scrollable.ensureVisible(
+        context,
+        alignment: 0.5,
+        duration: const Duration(milliseconds: 200),
+        curve: Curves.easeOut,
+      );
+    });
   });
 }
 
@@ -25,13 +29,15 @@ void scrollContextToCenter(BuildContext? context) {
 /// controller aren't ready yet.
 void scrollToCurrentItem(ScrollController controller, GlobalKey firstItemKey, int currentIndex) {
   WidgetsBinding.instance.addPostFrameCallback((_) {
-    if (!controller.hasClients) return;
-    final itemHeight = (firstItemKey.currentContext?.findRenderObject() as RenderBox?)?.size.height;
-    if (itemHeight == null) return;
-    final maxExtent = controller.position.maxScrollExtent;
-    if (!maxExtent.isFinite) return;
-    final target = (currentIndex * itemHeight).clamp(0.0, maxExtent);
-    controller.jumpTo(target);
+    Timer.run(() {
+      if (!controller.hasClients) return;
+      final itemHeight = (firstItemKey.currentContext?.findRenderObject() as RenderBox?)?.size.height;
+      if (itemHeight == null) return;
+      final maxExtent = controller.position.maxScrollExtent;
+      if (!maxExtent.isFinite) return;
+      final target = (currentIndex * itemHeight).clamp(0.0, maxExtent);
+      controller.jumpTo(target);
+    });
   });
 }