Speedup DiffNote#active? on discussions, preloading noteables and avoid...
Speedup DiffNote#active? on discussions, preloading noteables and avoid touching git repository to return diff_refs when possible - Preloading noteable we share the same noteable instance when more than one discussion refers to the same noteable. - Any other call to that object that is cached in that object will be for any discussion. - In those cases where merge_request_diff has all the sha stored to build a diff_refs get that diff_refs using directly those sha instead accessing to the git repository to first get the commits and later the sha.
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