Change Details

There is some kind of issue that can cause duplicate roots (topics) in view-topiclist requests. I noticed it when working on https://gerrit.wikimedia.org/r/#/c/170998/ , but it turns out that it's present on master and even production. Production example: https://www.mediawiki.org/w/api.php?action=flow&format=jsonfm&page=Talk%3AFlow_QA&submodule=view-topiclist&vtloffset-dir=rev&vtllimit=10&vtloffset-id=rqe9hb1t8yarz97m Paste for posterity: {P124} You can see that the following topics are duplicated in the roots array (the whole segment appears twice): ``` "ry51fussyfpos7k9", "ry4n6b5cpy6y9o4h", "rs9l9vau450s2nvr", "rqgvx99tpd5njsdj" ```