Fix TreeDataGridPresenterBase Replace Regression #266
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This fixes #265. The more efficient use of
ItemsReplacedis kept when the old and new items have the same length. Otherwise, the previous behavior is used.Note that AvaloniaUI/Avalonia#13795 made the same change to
VirtualizingStackPanelthat was made toTreeDataGridPresenterBasewhich caused the issue. I haven't used theVirtualizingStackPanelbefore, so I can't test if it has the same issue.