debugLastParentDataRefreshIterationCount property
Iteration count of the post-sticky parentData refresh loop on the
last layout. Reset at the top of performLayout. Used by Phase 4's
regression test to verify the loop bound is O(_children), not
O(visibleNodes), without relying on flaky wall-time measurements.
Implementation
@visibleForTesting
int debugLastParentDataRefreshIterationCount = 0;