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I've implement a module, where I leverage the checkout process without having the cart functionality. So I disabled the cart module, but it turned out the review-pane for showing the order's content on the review step is provided via the "shopping cart contents" pane.
Turns out this pane lists the content of the order anyway, not the content of the cart (as it should be). Thus, I think this pane should be provided by the checkout module not by the cart module.