Nate Wilson 360e42c7af
Factor out Container objects (#153619)
This pull request follows up on [a PR from 4 months ago](https://github.com/flutter/flutter/pull/147432) that aimed to reduce the number of `Container` objects in the framework.

I feel like now's a good time to wrap it up!
(especially since I've gained a grasp of how "rebase" vs. "merge commit" can [affect test results](https://github.com/flutter/flutter/blob/master/docs/contributing/Tree-hygiene.md#using-git) 🙂)

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resolves #147431
2024-09-11 23:59:53 +00:00
..