RG-2773 Fix empty row on scroll up in dropdown#9261

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Hypnosphi wants to merge 3 commits intomasterfrom

air/https-youtrack.jetbrains.com-issue-rg-2773-ringui-empty-row-appe-b402cf83-1

Commits on Apr 10, 2026

RG-2773 Fix empty row on scroll up in dropdown by recomputing row heights on visibility change

Hypnosphi
and
claude
committed
RG-2773 Add IntersectionObserver mock to test setup

Hypnosphi
and
claude
committed
RG-2773 Address review: guard observer, add tests

Hypnosphi
and
claude
committed