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7aa4d2d3ec
@ayyoub-coder gave a fantastic summary of the problem in #160177: if a `Container` doesn't have a child or unbounded constraints, it will expand to fill its parent, whereas a `ColoredBox` defaults to zero size. I also noticed that in the main branch, the `PositionedDirectional` widget has an unused `width` parameter, and instead builds a `SizedBox` child for it. This pull request cleans up the `Stepper` subtree a bit and allows the connector to display properly. fixes #160156