https://bugzilla.wikimedia.org/show_bug.cgi?id=30211

--- Comment #1 from John Du Hart <[email protected]> 2011-08-11 02:54:34 UTC 
---
The example is really weird. Both moves are A -> B, however in my tests trying
to move A -> B (Open two move windows, submit one after the other), I get an
error on the last one about B already existing and asking for my permission
(Because I'm a sysop) before deleting B to make way for A. It's possible that
there was DB lag which caused for nothing to happen for user 2.

On a similar note, trying to do 2 moves in a similar fashion except as A -> B
and A -> C results in a double redirect of  A -> C -> B. Probably the best
prevention of this is race condition check (Similar to how edit conflicts are
handled).

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