If this commit is parsed, has parents, and has the supplied flag set on it we automatically add it to the parents, grand-parents, and so on until an unparsed commit or a commit with no parents is discovered. This permits applications to force a flag through the history chain when necessary. @param flag the single flag value to carry back onto parents.
A carried flag is copied from the child commit onto its parents when the child commit is popped from the lowest level of walk's internal graph. @param flag the flag to carry onto parents, if set on a descendant.
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