fix: fix identation, fix error theme in demo.

demo/Semi.Avalonia.TreeDataGrid.Demo/MainWindow.axaml

@@ -112,10 +112,18 @@
                                             </MultiBinding>
                                         </Image.Source>
                                     </Image>
-                                    <TextBox VerticalAlignment="Center" Text="{Binding Name}" />
+                                    <TextBox
+                                        VerticalAlignment="Center"
+                                        Classes="Small"
+                                        Text="{Binding Name}">
+                                        <TextBox.Styles>
+                                            <Style Selector="DataValidationErrors">
+                                                <Setter Property="Theme" Value="{DynamicResource TooltipDataValidationErrors}" />
+                                            </Style>
+                                        </TextBox.Styles>
+                                    </TextBox>
                                 </StackPanel>
                             </DataTemplate>
-
                         </TreeDataGrid.Resources>
                         <TreeDataGrid.Styles>
                             <Style Selector="TreeDataGrid TreeDataGridRow:nth-child(2n)">

demo/Semi.Avalonia.TreeDataGrid.Demo/ViewModels/FilesPageViewModel.cs

@@ -180,10 +180,7 @@ public class FileNodeViewModel: ObservableObject, IEditableObject
     private bool _hasChildren = true;
     private bool _isExpanded;
 
-        public FileNodeViewModel(
-            string path,
-            bool isDirectory,
-            bool isRoot = false)
+    public FileNodeViewModel( string path, bool isDirectory, bool isRoot = false)
     {
         _path = path;
         _name = isRoot ? path : System.IO.Path.GetFileName(Path);