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Fix VirtualizingStackPanel ScrollToEnd with variable-sized items - #22014
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Keep the initial viewport before the variable-sized trailing items and exercise ScrollToEnd directly.
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MrJul
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emmauss
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Aug 24, 2026
MrJul
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…loniaUI#22014) * Fix VirtualizingStackPanel ScrollToEnd with variable-sized items * Refine VirtualizingStackPanel ScrollToEnd regression test Keep the initial viewport before the variable-sized trailing items and exercise ScrollToEnd directly. --------- Co-authored-by: Emmanuel Hansen <emmausssss@gmail.com>
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What does the pull request do?
Fixes
VirtualizingStackPanelfailing to scroll to the actual end whenScrollBar.ScrollToEnd()is called and trailing items have different sizes.What is the current behavior?
What is the updated/expected behavior with this PR?
How was the solution implemented (if it's not obvious)?
When the viewport reaches the current panel end before all items have been
measured,
VirtualizingStackPaneluses the last item as the realization anchor.After measuring that item, its position is corrected using the actual size so
the extent and offset can be synchronized to the real end.
Checklist
Fixed issues
Fixes #22013