khepri_tree: Ignore keep_while conditions on children on node creation
#351
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Why
If a parent has a
keep_whilecondition on a child node, the child node can't possibly exist when the parent is created. Therefore, ignore this condition when the parent is created because it will always be false.How
Drop
keep_whileconditions on nodes that have the created node as prefix.While here, move this logic to its own function.