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Alex Jbanca
c503073f6b
The right model data access is expensive because we need to search the right model for a matching key on every `data` call. This commit adds a LRU cache to the `data` call, storing by default up to 1000 rows. The cache mechanism uses a QCache for fast index lookup and a std::list to preserve the access order and to ensure a controlled cache removal. + fix compilation errors on ConcatModel and WritableProxyModel