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Campbell Barton 366865dd02 Undo System: replace with simpler binary diffing buffer storage ...

Applying/undoing incremental changes didn't fit well when
mixed with periodic snapshots from mem-file undo.

This moves to a much simpler undo system.

- Uses array storage with de-duplication from `BLI_array_store`.
- Loads the buffer into existing text data,
  for better performance on large files.
- Has the advantage that Python operators can be supported
  since we don't depend on hard coded undo operations.

Solves T67045, T66695, T65909.

2019-07-17 21:19:22 +10:00

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