Fix sampled translation #4017
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Fix sampled translation #4017
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Changelog Entry
To be copied to the draft changelog by merger:
Description
Graphs created using
GBWTGraph::subgraph()did not copy the node-to-segment translation correctly from the supergraph. This affected the sampled graphs fromvg haplotypes. When the translation was used, such as when extracting the GFA from the GBZ, segments got empty and/or incorrect names. This PR fixes the issue and resolves #4016.There are also some developer tools for investigating the behavior of haplotype sampling at the level of an individual variant / subchain.