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pack-objects: refactor path-walk delta phase
Previously, the --path-walk option to 'git pack-objects' would compute deltas inline with the path-walk logic. This would make the progress indicator look like it is taking a long time to enumerate objects, and then very quickly computed deltas. Instead of computing deltas on each region of objects organized by tree, store a list of regions corresponding to these groups. These can later be pulled from the list for delta compression before doing the "global" delta search. This presents a new progress indicator that can be used in tests to verify that this stage is happening. The current implementation is not integrated with threads, but could be done in a future update. Since we do not attempt to sort objects by size until after exploring all trees, we can remove the previous change to t5530 due to a different error message appearing first. Signed-off-by: Derrick Stolee <stolee@gmail.com>
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