About [[MediaWiki:Default-skin-not-found/en]] and [[MediaWiki:Default-skin-not-found-no-skins/en]]
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Suggesting to add another list element that should refer to developers wanting to check out all skins in the mediaWiki repoitory via git, and provide, or link to, a command sample how to do so.
I updated the page https://www.mediawiki.org/wiki/Download_from_Git#Using_Git_to_download_MediaWiki_skins and submitted a patch to link to it: https://gerrit.wikimedia.org/r/211809