fix: add ScrollViewer event handler to disable scroll indicators based on scroll position

Author: gadfly3173

src/Views/Launcher.axaml

@@ -96,7 +96,8 @@
                       VerticalScrollBarVisibility="Disabled"
                       DoubleTapped="MaximizeOrRestoreWindow"
                       PointerPressed="BeginMoveWindow"
-                      PointerWheelChanged="ScrollTabs">
+                      PointerWheelChanged="ScrollTabs"
+                      ScrollChanged="OnTabsScrollChanged">
           <StackPanel x:Name="launcherTabsBar" Orientation="Horizontal" SizeChanged="UpdateScrollIndicator">
             <ListBox Classes="launcher_page_tabbar"
                      ItemsSource="{Binding Pages}"

src/Views/Launcher.axaml.cs

@@ -265,6 +265,15 @@ private void UpdateScrollIndicator(object sender, SizeChangedEventArgs e)
             e.Handled = true;
         }
 
+        private void OnTabsScrollChanged(object sender, ScrollChangedEventArgs e)
+        {
+            if (sender is ScrollViewer scrollViewer)
+            {
+                leftScrollIndicator.IsEnabled = scrollViewer.Offset.X > 0;
+                rightScrollIndicator.IsEnabled = scrollViewer.Offset.X < scrollViewer.Extent.Width - scrollViewer.Viewport.Width;
+            }
+        }
+
         private void SetupDragAndDrop(object sender, RoutedEventArgs e)
         {
             if (sender is Border border)