Andreas Kling f73aa8e2bd LibWeb: Move line boxes from Layout::Box to BlockContainer ...

Per the spec, only a BlockContainer" can have line boxes, so let's not
clutter up every Layout::Box with line boxes.

This also allows us to establish an invariant that BFC and IFC always
operate on a Layout::BlockContainer.

Note that if BlockContainer has all block-level children, its line boxes
are not used for anything. They are only used in the all inline-level
children scenario.

2021-10-06 21:53:25 +02:00

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