add IsScrollInertiaEnabled setter and getter

src/Avalonia.Controls/ScrollViewer.cs

@@ -775,6 +775,22 @@ namespace Avalonia.Controls
             control.SetValue(VerticalScrollBarVisibilityProperty, value);
         }
 
+        /// <summary>
+        /// Gets whether scroll gestures should include inertia in their behavior and value.
+        /// </summary>
+        public static bool GetIsScrollInertiaEnabled(Control control)
+        {
+            return control.GetValue(IsScrollInertiaEnabledProperty);
+        }
+
+        /// <summary>
+        /// Sets whether scroll gestures should include inertia in their behavior and value.
+        /// </summary>
+        public static void SetIsScrollInertiaEnabled(Control control, bool value)
+        {
+            control.SetValue(IsScrollInertiaEnabledProperty, value);
+        }
+
         /// <inheritdoc/>
         public void RegisterAnchorCandidate(Control element)
         {

src/Avalonia.Themes.Fluent/Controls/ListBox.xaml

@@ -19,6 +19,7 @@
     <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled" />
     <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto" />
     <Setter Property="ScrollViewer.IsScrollChainingEnabled" Value="True" />
+    <Setter Property="ScrollViewer.IsScrollInertiaEnabled" Value="True" />
     <Setter Property="FontSize" Value="{DynamicResource ControlContentThemeFontSize}" />
     <Setter Property="Template">
       <ControlTemplate>
@@ -34,6 +35,7 @@
                         HorizontalScrollBarVisibility="{TemplateBinding (ScrollViewer.HorizontalScrollBarVisibility)}"
                         VerticalScrollBarVisibility="{TemplateBinding (ScrollViewer.VerticalScrollBarVisibility)}"
                         IsScrollChainingEnabled="{TemplateBinding (ScrollViewer.IsScrollChainingEnabled)}"
+                        IsScrollInertiaEnabled="{TemplateBinding (ScrollViewer.IsScrollInertiaEnabled)}"
                         AllowAutoHide="{TemplateBinding (ScrollViewer.AllowAutoHide)}">
             <ItemsPresenter Name="PART_ItemsPresenter"
                             AreVerticalSnapPointsRegular="{TemplateBinding AreVerticalSnapPointsRegular}"