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Maven Repo Browser > Local > Update Index. Indexes it, then immediately restarts the indexing for no apparent reason.
I believe I've found the root cause of this problem loadIndexingContext() used to trigger an index retrieval itself, and then indexRepo itself did it again. No longer reproducible in latest sources.
Fixed by fix of bug #200263 (2809e8de3470) then. *** This bug has been marked as a duplicate of bug 200263 ***