refactor: 更改滚动条位置

Author: ArgoZhang

src/BootstrapBlazor/Components/TreeView/TreeView.razor

@@ -39,12 +39,14 @@ else
             }
             else
             {
-                @SearchTemplate
+                <div class="tree-search">
+                    @SearchTemplate
+                </div>
             }
         }
         @if (IsVirtualize)
         {
-            <div class="tree-root is-virtual" tabindex="0">
+            <div class="tree-root scroll is-virtual" tabindex="0">
                 <Virtualize ItemSize="RowHeight" OverscanCount="10" Items="@Rows">
                     <ItemContent>
                         @RenderTreeRow(context)
@@ -54,7 +56,7 @@ else
         }
         else
         {
-            <div class="tree-root" tabindex="0">
+            <div class="tree-root scroll" tabindex="0">
                 @foreach (var item in Rows)
                 {
                     @RenderTreeRow(item)

src/BootstrapBlazor/Components/TreeView/TreeView.razor.cs

@@ -17,7 +17,7 @@ public partial class TreeView<TItem> : IModelEqualityComparer<TItem>
     /// <summary>
     /// 获得 按钮样式集合
     /// </summary>
-    private string? ClassString => CssBuilder.Default("tree-view scroll")
+    private string? ClassString => CssBuilder.Default("tree-view")
         .AddClass("is-fixed-search", ShowSearch && IsFixedSearch)
         .AddClassFromAttributes(AdditionalAttributes)
         .Build();