feat: add hacks for internal textbox error display.

src/Semi.Avalonia/Controls/DataValidationErrors.axaml

@@ -38,4 +38,18 @@
             </DataTemplate>
         </Setter>
     </ControlTheme>
+    <ControlTheme x:Key="SilentDataValidationErrors" TargetType="DataValidationErrors">
+        <Setter Property="Template">
+            <ControlTemplate TargetType="DataValidationErrors">
+                <ContentPresenter
+                    Name="PART_ContentPresenter"
+                    Padding="{TemplateBinding Padding}"
+                    Background="{TemplateBinding Background}"
+                    BorderThickness="{TemplateBinding BorderThickness}"
+                    Content="{TemplateBinding Content}"
+                    ContentTemplate="{TemplateBinding ContentTemplate}"
+                    CornerRadius="{TemplateBinding CornerRadius}" />
+            </ControlTemplate>
+        </Setter>
+    </ControlTheme>
 </ResourceDictionary>

src/Semi.Avalonia/Controls/NumericUpDown.axaml

@@ -28,11 +28,13 @@
                             VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
                             AcceptsReturn="False"
                             CornerRadius="{TemplateBinding CornerRadius}"
+                            DataValidationErrors.Errors="{ReflectionBinding $parent[NumericUpDown].(DataValidationErrors.Errors)}"
                             FontSize="{TemplateBinding FontSize}"
                             Foreground="{TemplateBinding Foreground}"
                             IsReadOnly="{TemplateBinding IsReadOnly}"
                             Text="{TemplateBinding Text}"
                             TextWrapping="NoWrap"
+                            Theme="{DynamicResource NonErrorTextBox}"
                             Watermark="{TemplateBinding Watermark}" />
                     </ButtonSpinner>
                 </DataValidationErrors>
@@ -45,7 +47,7 @@
         <Style Selector="^.Small /template/ TextBox#PART_TextBox">
             <Setter Property="MinHeight" Value="{DynamicResource NumericUpDownWrapperSmallHeight}" />
         </Style>
-        
+
         <Style Selector="^:error">
             <Style Selector="^ /template/ TextBox#PART_TextBox">
                 <Setter Property="Background" Value="{DynamicResource DataValidationErrorsBackground}" />

src/Semi.Avalonia/Controls/TextBox.axaml

@@ -274,4 +274,13 @@
             </Style>
         </Style>
     </ControlTheme>
+
+    <ControlTheme
+        x:Key="NonErrorTextBox"
+        BasedOn="{StaticResource {x:Type TextBox}}"
+        TargetType="TextBox">
+        <Style Selector="^ /template/ DataValidationErrors">
+            <Setter Property="Theme" Value="{DynamicResource SilentDataValidationErrors}" />
+        </Style>
+    </ControlTheme>
 </ResourceDictionary>