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test(e2e): virtual scroll over 50 000 rows - #1124
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Part of #1051.
e2e_grid_virtual_scroll_test.dart: with 50 000 rows only the viewport's rows are built, repeated fast flings keep the built-row count and row cache bounded, the last row is reachable and scrolling back restores the first.No timing assertions on purpose: they would be flaky on shared CI runners.
Not covered: EXPLAIN and a Cancel button — the generic SQL workspace has neither control (
explainQuerylives only in the per-database delegates, cancel runs on dispose).