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Kai Willadsen authored
Calculation of inline diffs is one of the most expensive things we do, but most changes to the diffed text result in very few changed blocks. This patch adds a simple caching mechanism to avoid constantly rediffing unchanged blocks. Currently, blocks are evicted from the cache on a LRU basis, which isn't perfect but works reasonably well. In combination with the previous patch, this closes bgo#168139.
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