change template for datavalidation errors.

src/Avalonia.Themes.Fluent/DataValidationErrors.xaml

@@ -14,39 +14,31 @@
   <Setter Property="Template">
     <ControlTemplate>
       <DockPanel LastChildFill="True">
-        <ContentControl DockPanel.Dock="Right"
-                        ContentTemplate="{TemplateBinding ErrorTemplate}"
-                        DataContext="{TemplateBinding Owner}"
-                        Content="{Binding (DataValidationErrors.Errors)}"
-                        IsVisible="{Binding (DataValidationErrors.HasErrors)}"/>
-        <ContentPresenter Name="PART_ContentPresenter"
-                          Background="{TemplateBinding Background}"
-                          BorderBrush="{TemplateBinding BorderBrush}"
-                          BorderThickness="{TemplateBinding BorderThickness}"
-                          ContentTemplate="{TemplateBinding ContentTemplate}"
-                          Content="{TemplateBinding Content}"
-                          Padding="{TemplateBinding Padding}"/>
+        <ContentControl
+          DockPanel.Dock="Bottom"
+          ContentTemplate="{TemplateBinding ErrorTemplate}"
+          DataContext="{TemplateBinding Owner}"
+          Content="{Binding (DataValidationErrors.Errors)}"
+          IsVisible="{Binding (DataValidationErrors.HasErrors)}" />
+        <ContentPresenter
+          Name="PART_ContentPresenter"
+          Background="{TemplateBinding Background}"
+          BorderThickness="{TemplateBinding BorderThickness}"
+          ContentTemplate="{TemplateBinding ContentTemplate}"
+          Content="{TemplateBinding Content}"
+          Padding="{TemplateBinding Padding}" />
       </DockPanel>
     </ControlTemplate>
   </Setter>
   <Setter Property="ErrorTemplate">
     <DataTemplate>
-      <Canvas Name="PART_ErrorTemplateCanvas"
-              Width="14" Height="14" Margin="4 0 1 0" 
-              Background="Transparent">
-        <Canvas.Styles>
-          <Style Selector="Canvas#PART_ErrorTemplateCanvas ToolTip">
-            <Setter Property="BorderBrush" Value="{DynamicResource SystemControlErrorTextForegroundBrush}"/>
-          </Style>
-          <Style Selector="Canvas#PART_ErrorTemplateCanvas ToolTip TextBlock">
-            <Setter Property="TextWrapping" Value="Wrap" />
-          </Style>
-        </Canvas.Styles>
-        <ToolTip.Tip>
-          <ItemsControl Items="{Binding}"/>
-        </ToolTip.Tip>
-        <Path Data="M14,7 A7,7 0 0,0 0,7 M0,7 A7,7 0 1,0 14,7 M7,3l0,5 M7,9l0,2" Stroke="{DynamicResource SystemControlErrorTextForegroundBrush}" StrokeThickness="2"/>
-      </Canvas>
+      <ItemsControl Items="{Binding}">
+        <ItemsControl.ItemTemplate>
+          <DataTemplate>
+            <TextBlock Text="{Binding Message}" Foreground="{DynamicResource SystemControlErrorTextForegroundBrush}" TextWrapping="Wrap" />
+          </DataTemplate>
+        </ItemsControl.ItemTemplate>
+      </ItemsControl>
     </DataTemplate>
   </Setter>
 </Style>