[release/11.0-preview4] Virtualization AnchorMode with for variable-height support#66521

Merged

wtgodbe merged 29 commits intodotnet:release/11.0-preview4from

ilonatommy:backport/pr-66262-to-release/11.0-preview4

Apr 29, 2026

Commits on Apr 28, 2026

Add VirtualizeAnchorMode with anchor snapshot/restore for variable-height support

ilonatommy
and
Copilot
committed
Fix tests.
ilonatommy
committed
Unit tests were missing anchorMode.
ilonatommy
committed
Small cleanup.
ilonatommy
committed
Fix - better tests that match real UX, bigger varaibility range and stability fixes.

ilonatommy
and
Copilot
committed
New test: make sure that before scroll happens the scrol is positioned properly on expansion.
ilonatommy
committed
Indeces.
ilonatommy
committed
Fix provider case with `ItemKey` approach.
ilonatommy
committed
ItemProvider support + more tests for window scroll, same as we have for container scroll.
ilonatommy
committed
Refactoring.
ilonatommy
committed
Make test deterministic
ilonatommy
committed
Feedback.
ilonatommy
committed
Warning is too silent, throw instead.
ilonatommy
committed
Analyzer instead of exception.
ilonatommy
committed
Update analyzer text.
ilonatommy
committed
Fix in-DOM auto-follow + do not re-engage after user scrolls away from the edge + remove drift correction because it was causing sub-pixel shifts.
ilonatommy
committed
Test item provider loading with delay. Fix tests to not modify the collection outside of the item provider call.
ilonatommy
committed
Test for shost lists without scroll that grow to have a scroll - end mode should converge for them.
ilonatommy
committed
Short list fix was too broad - update.
ilonatommy
committed
Missing change for the previous commit.
ilonatommy
committed
Document deletion behavior - above the viewport will cause a jump, otherwise it's working.
ilonatommy
committed
Change `ItemKey` -> `ItemComparer` to not break non-ref comparison items when new param is not provided.
ilonatommy
committed
This test should be mirroring end-testing reengage test + add logging.
ilonatommy
committed
Missing renames.
ilonatommy
committed
Variables can be merged into one.
ilonatommy
committed
Feedback: align test infra.
ilonatommy
committed
Feedback: default value for comparer + test for in-memory items prepend detection with a fix for it.
ilonatommy
committed
Merge branch 'release/11.0-preview4' of https://github.com/dotnet/aspnetcore into backport/pr-66262-to-release/11.0-preview4
ilonatommy
committed

Commits on Apr 29, 2026

Stabilize preparations to test actions.
ilonatommy
committed

Provide feedback

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[release/11.0-preview4] Virtualization AnchorMode with for variable-height support#66521

[release/11.0-preview4] Virtualization AnchorMode with for variable-height support#66521
wtgodbe merged 29 commits intodotnet:release/11.0-preview4from
ilonatommy:backport/pr-66262-to-release/11.0-preview4

Commits on Apr 28, 2026

Add VirtualizeAnchorMode with anchor snapshot/restore for variable-height support

Fix tests.

Unit tests were missing anchorMode.

Small cleanup.

Fix - better tests that match real UX, bigger varaibility range and stability fixes.

New test: make sure that before scroll happens the scrol is positioned properly on expansion.

Indeces.

Fix provider case with `ItemKey` approach.

ItemProvider support + more tests for window scroll, same as we have for container scroll.

Refactoring.

Make test deterministic

Feedback.

Warning is too silent, throw instead.

Analyzer instead of exception.

Update analyzer text.

Fix in-DOM auto-follow + do not re-engage after user scrolls away from the edge + remove drift correction because it was causing sub-pixel shifts.

Test item provider loading with delay. Fix tests to not modify the collection outside of the item provider call.

Test for shost lists without scroll that grow to have a scroll - end mode should converge for them.

Short list fix was too broad - update.

Missing change for the previous commit.

Document deletion behavior - above the viewport will cause a jump, otherwise it's working.

Change `ItemKey` -> `ItemComparer` to not break non-ref comparison items when new param is not provided.

This test should be mirroring end-testing reengage test + add logging.

Missing renames.

Variables can be merged into one.

Feedback: align test infra.

Feedback: default value for comparer + test for in-memory items prepend detection with a fix for it.

Merge branch 'release/11.0-preview4' of https://github.com/dotnet/aspnetcore into backport/pr-66262-to-release/11.0-preview4

Commits on Apr 29, 2026

Stabilize preparations to test actions.