fixed a bug of GrowlWindow

src/Shared/HandyControl_Shared/Controls/Growl/Growl.cs

@@ -800,7 +800,7 @@ namespace HandyControl.Controls
             _timerClose?.Stop();
             var transform = new TranslateTransform();
             _gridMain.RenderTransform = transform;
-            var animation = AnimationHelper.CreateAnimation(MaxWidth);
+            var animation = AnimationHelper.CreateAnimation(ActualWidth);
             animation.Completed += (s, e) =>
             {
                 if (Parent is Panel panel)

src/Shared/HandyControl_Shared/Controls/Growl/GrowlWindow.cs

@@ -3,24 +3,27 @@ using System.Windows.Controls;
 
 namespace HandyControl.Controls
 {
-    [TemplatePart(Name = ElementGrowPanel, Type = typeof(Panel))]
     internal class GrowlWindow : Window
     {
-        private const string ElementGrowPanel = "PART_GrowPanel";
-
         public Panel GrowlPanel { get; set; }
 
         public GrowlWindow()
         {
             WindowStyle = WindowStyle.None;
             AllowsTransparency = true;
-        }
 
-        public override void OnApplyTemplate()
-        {
-            base.OnApplyTemplate();
+            GrowlPanel = new StackPanel
+            {
+                VerticalAlignment = VerticalAlignment.Top,
+                Margin = new Thickness(0, 10, 10, 10)
+            };
 
-            GrowlPanel = GetTemplateChild(ElementGrowPanel) as Panel;
+            Content = new ScrollViewer
+            {
+                VerticalScrollBarVisibility = ScrollBarVisibility.Hidden,
+                IsEnableInertia = true,
+                Content = GrowlPanel
+            };
         }
 
         public void Init()

src/Shared/HandyControl_Shared/Themes/Styles/Growl.xaml

@@ -19,15 +19,6 @@
         <Setter Property="ShowActivated" Value="False"/>
         <Setter Property="ShowInTaskbar" Value="False"/>
         <Setter Property="Topmost" Value="True"/>
-        <Setter Property="Template">
-            <Setter.Value>
-                <ControlTemplate TargetType="controls:GrowlWindow">
-                    <controls:ScrollViewer VerticalScrollBarVisibility="Hidden" IsEnableInertia="True">
-                        <StackPanel Name="PART_GrowPanel" VerticalAlignment="Top" Margin="0,10,10,10"/>
-                    </controls:ScrollViewer>
-                </ControlTemplate>
-            </Setter.Value>
-        </Setter>
     </Style>
 
     <Style TargetType="controls:Growl">