Auto merge of #29887 - Loirooriol:float-inline-size-complete, r=mrobinson

Handle floats in BlockContainer::inline_content_sizes

Typically, block-level contents are stacked vertically, so this was just taking the maximum size among all contents. However, floats can be stacked horizontally, so we need to sum their sizes.

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- [X] These changes fix #29874

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