Boqin Qin ba068d40dd core: add check in AddChildIndexer to avoid double lock (#20982) ...

This fixes a theoretical double lock condition which could occur in

    indexer.AddChildIndexer(indexer)

Nobody would ever do that though.

Co-authored-by: Felix Lange <fjl@twurst.com>

2020-04-27 15:16:30 +02:00

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