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03c4111299
Call `ZSTD_enforceMaxDist()` before each block with the beginning of the block. This ensures that `lowLimit` is updated to `dictLimit` whenever the ext-dict is out of range, so we can use prefix mode for speed. This can cause non-determinism because prefix mode and ext-dict mode match finders can return different results. It can also hurt speed because ext-dict match finders are slower. The scenario is: 1. Compress large data with a dictionary. 2. The dictionary goes out of bounds, so we invalidate it. 3. However, we still have `lowLimit < dictLimit`, since it is never updated. 4. We will call the ext-dict match finder instead of the prefix one.