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After f7a3f785a8, sibling nodes' styles
were no longer invalidated after a node was removed. This reuses the
flag for `:first-child` and `:last-child` to indicate that a node's
style might be affected by any structural change in its siblings.
Fixes #4631.
Resolves the `:only-child` ACID3 failure as documented in #1231.
938 B
938 B