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Fix auto-sized VirtualizingStackPanel not rendering - #22081
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* Add failing test for auto-sized VSP * Fix auto-sized VirtualizingStackPanel not rendering
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What does the pull request do?
This PR fixes a recent regression introduced in #22014: the anchor was placed at the end even when the viewport was at the beginning of the list. In other words, the first item was incorrectly placed at negative bounds, outside of the viewport.
Visually, this manifested as an empty list when a single item was present and the
VirtualizingStackPanelwas auto-sized (effectively disabling virtualization, but that's not a reason for it not to work correctly).A matching unit test has been added.