blueprint: add extra comments to Validate{,LayoutConstraints}
#1064
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This commit ensures that the roles of
Validate{,LayoutConstraints}
are clearer from the code comments.Follwup, c.f.
#1041 (comment)
[fwiw, writing it down like this still makes me feel like we currently optimize for the uncommon case here and users can easily forget to call the right API, but adding these comments is useful hopefully in any case]