Andreas Kling 515db5fc1b LibWeb: Make Layout::FormattingState copies shallow ...

Previously, each NodeState in a FormattingState was shared with the
parent FormattingState, but the HashMap of NodeState had to be copied
when making FormattingState copies.

This patch makes copying instant by keeping a pointer to the parent
FormattingState instead. When fetching immutable state via get(), we may
now return a reference to a NodeState owned by a parent FormattingState.

get_mutable() will copy any NodeState found in the ancestor chain before
making a brand new one.

2022-03-13 00:04:51 +01:00

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