Change 383940 had a related patch set uploaded (by Jdlrobson; owner: Jdlrobson):
[mediawiki/core@master] Installer should make use of valid skin names

https://gerrit.wikimedia.org/r/383940

This feature is apparently implemented in two places:

• For the installer, it's in Installer::findExtensions() and LocalSettingsGenerator::generateExtEnableLine().
• For the fallback skin, it's in SkinFallbackTemplate::findInstalledSkins() and getSnippetForSkin().

In the screenshot you provided, that's actually the fallback skin (which is what you get after you complete the installer and your wiki has no skins).

(And yes, this duplication sucks and it would be great to avoid it. It actually looks very doable to make the installer methods public and make the fallback skin use them, if you'd like to work on that.)

Your right I'm talking about the fallback skin not the installer. I haven't checked what happens inside the installer. The fallback skin was what I was trying to fix.

This also allows for skin.json to provide more metadata in future - for instance a screenshot.

Note that screenshots are already implemented, see https://www.mediawiki.org/wiki/Manual:Skinning_Part_2#Screenshots

Change 383940 abandoned by Jdlrobson:
Installer should make use of valid skin names

Reason:
hoping some one else has bandwidth to pick this up

https://gerrit.wikimedia.org/r/383940