Andreas Kling 749e3f0f30 LibHTML: Add LayoutNodeWithStyle class, make LayoutText style-less ...

Since LayoutText always inherits style, it shouldn't store any style of
its own. This patch adds a LayoutNodeWithStyle class to sit between
LayoutNode and everyone who wants to inherit from LayoutNode except
LayoutText :^)

Since LayoutText can never have children, we also know that the parent
of any LayoutNode is always going to be a LayoutNodeWithStyle.
So this patch makes LayoutNode::parent() return LayoutNodeWithStyle*.

2019-10-07 10:56:44 +02:00

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