code cleanup

Author: w-ahmad

src/TableViewColumnHeader.OptionsFlyoutViewModel.cs

@@ -15,8 +15,6 @@ public partial class TableViewColumnHeader
     private partial class OptionsFlyoutViewModel : INotifyPropertyChanged
     {
         public event PropertyChangedEventHandler? PropertyChanged;
-        private string? _filterText;
-        private bool _canFilter = true;
         private IList<TableViewFilterItem> _filterItems = [];
         private bool _canSetState = true;
 

src/TableViewHeaderRow.OptionsFlyoutViewModel.cs

@@ -67,11 +67,7 @@ private void CanExecuteDeselectAllCommand(XamlUICommand sender, CanExecuteReques
 
         private void ExecuteCopyCommand(XamlUICommand sender, ExecuteRequestedEventArgs e)
         {
-#if WINDOWS
-            var focusedElement = FocusManager.GetFocusedElement(TableView.XamlRoot); 
-#else
-            var focusedElement = FocusManager.GetFocusedElement();
-#endif
+            var focusedElement = FocusManager.GetFocusedElement(TableView.XamlRoot!); 
             if (focusedElement is FrameworkElement { Parent: TableViewCell })
             {
                 return;