Merge component ['#attributes'] with the ['#props']['attributes'].

Closes #3515506

changed title from Merge component ['#attributes'] with the ['#props']['attributes']. to WIP: Merge component ['#attributes'] with the ['#props']['attributes'].

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• e3ad0866 - Move merge logic to private function.

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• 558c4750 - Tests.

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changed title from WIP: Merge component ['#attributes'] with the ['#props']['attributes']. to Merge component ['#attributes'] with the ['#props']['attributes'].

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• 5e600def - Improve comments.

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