WPF/WinForms: Performance updates for Tree/GridView #2663
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Improve performance of GridView and especially TreeGridView when the collection resets, e.g. when expanding/collapsing rows. This works around a WPF issue where when the collection resets it throws away all realized rows instead of caching and re-using them.
For WinForms, it no longer auto sizes to all columns on expand/collapse as for large datasets that slows things down considerably.