Addds ItemsPresenter in Menu (#10788)

Author: siagupta0202

src/Microsoft.DotNet.Wpf/src/Themes/PresentationFramework.Fluent/Styles/Menu.xaml

@@ -23,10 +23,8 @@
                         BorderBrush="{TemplateBinding BorderBrush}"
                         BorderThickness="{TemplateBinding BorderThickness}"
                         Padding="{TemplateBinding Padding}">
-                        <StackPanel
-                            ClipToBounds="True"
-                            IsItemsHost="True"
-                            Orientation="Horizontal" />
+                        <ItemsPresenter 
+                            ClipToBounds="True" />
                     </Border>
                 </ControlTemplate>
             </Setter.Value>

src/Microsoft.DotNet.Wpf/src/Themes/PresentationFramework.Fluent/Themes/Fluent.Dark.xaml

@@ -3325,7 +3325,7 @@
       <Setter.Value>
         <ControlTemplate TargetType="{x:Type Menu}">
           <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}">
-            <StackPanel ClipToBounds="True" IsItemsHost="True" Orientation="Horizontal" />
+            <ItemsPresenter ClipToBounds="True" />
           </Border>
         </ControlTemplate>
       </Setter.Value>

src/Microsoft.DotNet.Wpf/src/Themes/PresentationFramework.Fluent/Themes/Fluent.HC.xaml

@@ -3238,7 +3238,7 @@
       <Setter.Value>
         <ControlTemplate TargetType="{x:Type Menu}">
           <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}">
-            <StackPanel ClipToBounds="True" IsItemsHost="True" Orientation="Horizontal" />
+            <ItemsPresenter ClipToBounds="True" />
           </Border>
         </ControlTemplate>
       </Setter.Value>

src/Microsoft.DotNet.Wpf/src/Themes/PresentationFramework.Fluent/Themes/Fluent.Light.xaml

@@ -3334,7 +3334,7 @@
       <Setter.Value>
         <ControlTemplate TargetType="{x:Type Menu}">
           <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}">
-            <StackPanel ClipToBounds="True" IsItemsHost="True" Orientation="Horizontal" />
+            <ItemsPresenter ClipToBounds="True" />
           </Border>
         </ControlTemplate>
       </Setter.Value>