refactor: IsFixedSearch 移动到基类

Author: ArgoZhang

src/BootstrapBlazor/Components/Select/Select.razor.cs

@@ -68,12 +68,6 @@ public partial class Select<TValue> : ISelect, ILookup
     [Parameter]
     public Func<string, IEnumerable<SelectedItem>>? OnSearchTextChanged { get; set; }
 
-    /// <summary>
-    /// Gets or sets whether the search bar in the dropdown is fixed. Default is false.
-    /// </summary>
-    [Parameter]
-    public bool IsFixedSearch { get; set; }
-
     /// <summary>
     /// Gets or sets whether the select component is editable. Default is false.
     /// </summary>

src/BootstrapBlazor/Components/Select/SelectBase.cs

@@ -23,6 +23,12 @@ public abstract class SelectBase<TValue> : PopoverSelectBase<TValue>
     [Parameter]
     public bool ShowSearch { get; set; }
 
+    /// <summary>
+    /// Gets or sets whether the search bar in the dropdown is fixed. Default is false.
+    /// </summary>
+    [Parameter]
+    public bool IsFixedSearch { get; set; }
+
     /// <summary>
     /// Gets or sets the search icon.
     /// </summary>