Update ManagedFileChooser template part names

src/Avalonia.Dialogs/ManagedFileChooser.cs

@@ -10,8 +10,8 @@ using Avalonia.LogicalTree;
 
 namespace Avalonia.Dialogs
 {
-    [TemplatePart("QuickLinks", typeof(Control))]
-    [TemplatePart("Files",      typeof(ListBox))]
+    [TemplatePart("PART_QuickLinks", typeof(Control))]
+    [TemplatePart("PART_Files",      typeof(ListBox))]
     public class ManagedFileChooser : TemplatedControl
     {
         private Control _quickLinksRoot;

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

@@ -134,7 +134,7 @@
     <Setter Property="Template">
       <ControlTemplate>
         <DockPanel>
-          <ListBox x:Name="QuickLinks" DockPanel.Dock="Left" Items="{Binding QuickLinks}" SelectedIndex="{Binding QuickLinksSelectedIndex}" Focusable="False">
+          <ListBox x:Name="PART_QuickLinks" DockPanel.Dock="Left" Items="{Binding QuickLinks}" SelectedIndex="{Binding QuickLinksSelectedIndex}" Focusable="False">
             <ListBox.ItemTemplate>
               <DataTemplate>
                 <StackPanel Spacing="4" Orientation="Horizontal" Background="Transparent">
@@ -213,7 +213,7 @@
               <GridSplitter Grid.Column="7" />
               <TextBlock Grid.Column="8" Text="Size" />
             </Grid>
-            <ListBox x:Name="Files"
+            <ListBox x:Name="PART_Files"
                 VirtualizationMode="Simple"
                 Items="{Binding Items}"
                 Margin="0 5"

src/Avalonia.Themes.Simple/Controls/ManagedFileChooser.xaml

@@ -94,7 +94,7 @@
                    Text="{Binding FileName}"
                    Watermark="File name" />
 
-          <ListBox x:Name="QuickLinks"
+          <ListBox x:Name="PART_QuickLinks"
                    Margin="0,0,5,5"
                    BorderBrush="Transparent"
                    DockPanel.Dock="Left"
@@ -143,7 +143,7 @@
               <TextBlock Grid.Column="8"
                          Text="Size" />
             </Grid>
-            <ListBox x:Name="Files"
+            <ListBox x:Name="PART_Files"
                      Margin="0,5"
                      Items="{Binding Items}"
                      ScrollViewer.HorizontalScrollBarVisibility="Disabled"