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13a097e4 - [Story of Your Layout] Refactor Flex into Stack and move computations to different files (#1364)

[Story of Your Layout] Refactor Flex into Stack and move computations to different files (#1364) * Refactor Flex into Stack and move computations to different files * Fix CrossAxisAlignment.stretch computation * Add macOS golden tests and minor code clean ups * Delete flaky macos golden testing