This also works fine when the source tree DOES NOT contain all species of the target tree. Wherever the source tree does not define any ordering, the order of the target tree is kept.
This function is e.g. useful after you have added some species to a (copy of a) tree and then have optimized the tree: now you may want to sort the copied tree according to the original tree. That reduces the unwanted re-ordering caused by tree-optimization, without affecting the topology.
If you call the function several times with different source trees, the last call will be most dominant. Ordering effects of foregoing calls will remain in tree-regions uncovered by source-trees used in subsequent calls.
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