Merge pull request #259 from w-ahmad/fix/filterflyout-closes-on-space

fix: Prevent MenuFlyout click action on Space key press

Author: w-ahmad

src/TableViewColumnHeader.cs

@@ -257,6 +257,8 @@ protected override void OnApplyTemplate()
 #else
             _searchBox.KeyDown += OnSearchBoxKeyDown;
 #endif
+            // Handle Space key to prevent MenuFlyoutItem performing click action.
+            menuItem.PreviewKeyUp += static (_, e) => e.Handled = e.Key is VirtualKey.Space;
         }
 
         SetFilterButtonVisibility();
@@ -610,4 +612,4 @@ internal void EnsureGridLines()
     /// Gets a value indicating whether the cursor is in the sizing area.
     /// </summary>
     private bool IsSizingCursor => ProtectedCursor is InputSystemCursor { CursorShape: InputSystemCursorShape.SizeWestEast };
-}
+}