update IColumnFilterHandler.SelectedValues to ICollection<object?> for flexibility

Author: w-ahmad

src/ColumnFilterHandler.cs

@@ -122,5 +122,5 @@ public virtual bool Filter(TableViewColumn column, object? item)
     }
 
     /// <inheritdoc/>
-    public IDictionary<TableViewColumn, IList<object>> SelectedValues { get; } = new Dictionary<TableViewColumn, IList<object>>();
+    public IDictionary<TableViewColumn, ICollection<object?>> SelectedValues { get; } = new Dictionary<TableViewColumn, ICollection<object?>>();
 }

src/IColumnFilterHandler.cs

@@ -10,7 +10,7 @@ public interface IColumnFilterHandler
     /// <summary>
     /// Gets or sets the selected values for the filter per column.
     /// </summary>
-    IDictionary<TableViewColumn, IList<object>> SelectedValues { get; }
+    IDictionary<TableViewColumn, ICollection<object?>> SelectedValues { get; }
 
     /// <summary>
     /// Get the filter items for the specified column.

src/TableViewColumnHeader.OptionsFlyoutViewModel.cs

@@ -123,7 +123,7 @@ public IList<TableViewFilterItem> FilterItems
         /// <summary>
         /// Gets the selected values for the filter.
         /// </summary>
-        public List<object> SelectedValues { get; set; } = [];
+        public ICollection<object?> SelectedValues { get; set; } = [];
 
         /// <summary>
         /// Sets the state of the select all checkbox.