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Avoid calling `builder` in `ConstrainedLayoutBuilder` when layout constraints are the same. [Design doc](flutter.dev/go/layout-builder-optimization). ## Related Issues Fixes https://github.com/flutter/flutter/issues/6469
Automated Flutter integration test suites. Each suite consists of either a
complete Flutter app and a flutter_driver specification that drives tests
from the UI, or a native app that is meant to integrate with Flutter for
testing.
Intended for use with devicelab tests.
If you want to run a driver test locally, to debug a problem with a test, you can use this command from the appropriate subdirectory:
% flutter drive