WP_Comment::get_children()
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`WP_Comment_Query::fill_descendants()` queries for a comment tree in a way that minimizes database overhead, and places the located descendants with their proper parents. However, it doesn't touch leaf nodes - comments with no children - so future calls to `get_children()` on those comment objects result in unnecessary database queries. To prevent this, `fill_descendants()` now sets a `populated_children` flag on all located `WP_Comment` objects. See #8071. git-svn-id: https://develop.svn.wordpress.org/trunk@34730 602fd350-edb4-49c9-b593-d223f7449a82
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