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This merge request fixes / refers to the following issues: ...

Pull Request Description

This fix the regression because of #3523

At that time, user query 100 image with the same URL at the same time
Because NSURLSession only callback with 10 request completion once, we will query the disk cache in async concurrent and do 10x time more "real decoding and cache written operation" than user expected. This wastes CPU and RAM.

To optimize this case, we add a second memory cache check during the async disk cache query logic, but this logic should follows the same requirement as the first memory cache check

I copy the // First check the in-memory cache... comment 3 times to mention that these code should follows the same logic