transparent popups

src/Avalonia.Themes.Fluent/AutoCompleteBox.xaml

@@ -1,4 +1,5 @@
-<Styles xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+<Styles xmlns="https://github.com/avaloniaui" 
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
   <Design.PreviewWith>
     <Border Padding="20">
       <AutoCompleteBox Width="200">
@@ -43,17 +44,11 @@
                    DataValidationErrors.Errors="{TemplateBinding (DataValidationErrors.Errors)}" />
           
           <Popup Name="PART_Popup"
+                 WindowManagerAddShadowHint="False"
                  MinWidth="{Binding Bounds.Width, RelativeSource={RelativeSource TemplatedParent}}"
                  MaxHeight="{TemplateBinding MaxDropDownHeight}"
-                 StaysOpen="False"
-                 PlacementTarget="{TemplateBinding}">
-            <Popup.Styles>
-              <Style Selector="PopupRoot">
-                <Setter Property="WindowManagerAddShadowHint" Value="False" />
-                <Setter Property="TransparencyLevelHint" Value="Transparent" />
-                <Setter Property="Background" Value="{x:Null}" />
-              </Style>
-            </Popup.Styles>
+                 StaysOpen="False"                 
+                 PlacementTarget="{TemplateBinding}">            
             <Border Name="PART_SuggestionsContainer"
                     Padding="{DynamicResource AutoCompleteListMargin}"
                     BorderThickness="{DynamicResource AutoCompleteListBorderThemeThickness}"

src/Avalonia.Themes.Fluent/PopupRoot.xaml

@@ -1,17 +1,21 @@
-<Style xmlns="https://github.com/avaloniaui" Selector="PopupRoot">
-  <Setter Property="Background" Value="{DynamicResource ThemeBackgroundBrush}"/>
-  <Setter Property="Template">
-    <ControlTemplate>
-      <Panel>
-        <Border Name="PART_TransparencyFallback" IsHitTestVisible="False" />
-        <VisualLayerManager IsPopup="True">
-          <ContentPresenter Name="PART_ContentPresenter"
-                            Background="{TemplateBinding Background}"
-                            ContentTemplate="{TemplateBinding ContentTemplate}"
-                            Content="{TemplateBinding Content}"
-                            Padding="{TemplateBinding Padding}"/>
-        </VisualLayerManager>
-      </Panel>
-    </ControlTemplate>
-  </Setter>
-</Style>
+<Styles xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+  <Style Selector="PopupRoot">
+    <Setter Property="TransparencyLevelHint" Value="Transparent" />
+    <Setter Property="Background" Value="{x:Null}" />
+    <Setter Property="Template">
+      <ControlTemplate>
+        <Panel>
+          <Border Name="PART_TransparencyFallback" IsHitTestVisible="False" />
+          <VisualLayerManager IsPopup="True">
+            <ContentPresenter Name="PART_ContentPresenter"
+                              Background="{TemplateBinding Background}"
+                              ContentTemplate="{TemplateBinding ContentTemplate}"
+                              Content="{TemplateBinding Content}"
+                              Padding="{TemplateBinding Padding}"/>
+          </VisualLayerManager>
+        </Panel>
+      </ControlTemplate>
+    </Setter>
+  </Style>
+</Styles>