eefee47a8a
Previously we'd just allocate extra space for additional data for the deferred loading, and then do pointer arithmetic to access that data. This is cryptic and not type safe. Instead, use an internal type deriving from `PreviewImage`, and manage that internally. This ensures type safety, while keeping this as implementation detail (not visible outside of the preview image API) and keeping internals easy to understand. Some code did shallow copies of preview images, making ownership unclear. That made things a bit tricky, but I've made support for shallow copies explicit now and noted this in comments.
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