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Fix the scroll delta negation in the E2E version of picture_cache_perf benchmark #107678

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@flar flar commented Jul 14, 2022

The negation of these deltas caused a difference in the behavior of the E2E version of this benchmark as compared to the timeline version. In particular, the deltas were designed to perform 2 scrolls to the right and 2 to the left, but by negating the deltas the E2E version would start off with 2 animations of the "you've scrolled too far to the left" indicator which would skew the results.

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@flutter-dashboard flutter-dashboard bot added the c: contributor-productivity Team-specific productivity, code health, technical debt. label Jul 14, 2022
@flar flar requested a review from CareF July 14, 2022 21:54
@flar flar added the autosubmit Merge PR when tree becomes green via auto submit App label Jul 19, 2022
@auto-submit auto-submit bot merged commit dbe38ee into flutter:master Jul 19, 2022
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