## Description of the need
When vocabularies were entities in D7, whenever you updated a vocabulary, the presave and update hooks received the original (unchanged) vocabulary under $entity->original. In Backdrop, when vocabularies were demoted to config classes, this feature was removed.
It would be very helpful to bring back this feature. It's not hard to do.
## Proposed solution
In the `save` method of TaxonomyVocabulary, we'd need to load the original vocabulary before it's saved, and add it to the vocabulary object under `original`. We would also need to create a `vocabulary_load_unchanged()` function to circumvent the cache and load the original vocabulary before it's saved.
I can probably provide a PR for this soon. But I'd like to ask if there is interest in this feature?
Thanks for the guide, let me do just that. I hope there is still a chance of these seeing a backdrop port.
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