Masayuki Nakano 4a6cf53eeb Bug 1663370 - part 7: Make AutoInclusiveAncestorBlockElementsJoiner::Prepare() check the relation of its mLeftBlockElement and mRightBlockElement r=m_kato
The relation is important when the class handles both joining them and computing
target ranges.  Additionally, it's required to consider whether it can join the
block elements.  So, it should store the relation when `Prepare()` is called.

Depends on D89576

Differential Revision: https://phabricator.services.mozilla.com/D89577
2020-09-14 11:40:34 +00:00
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