**Status: blocked on understanding the problem. See T187859#4054069 for details.**
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Move Selenium test from [[ https://gerrit.wikimedia.org/r/#/c/404080/ | 404080 ]] from mediawiki/core to mediawiki/skins/Vector. The test is causing problems for other extensions and skins. See T185928 for more information.
The original commit ([[ https://gerrit.wikimedia.org/r/#/c/413157/ | 413157 ]]) caused problems for mediawiki/skins/MinervaNeue. See T188553 for more information. @Jdlrobson has reverted it ([[ https://gerrit.wikimedia.org/r/#/c/415393/ | 415393 ]]) until CI is fixed. The original commit is restored (but not merged) in [[ https://gerrit.wikimedia.org/r/#/c/415614/ | 415614 ]]. See [[ https://gerrit.wikimedia.org/r/#/q/topic:T187859 | topic:T187859 ]] for all commits.