The WikimediaIncubator extension has a function (fnTestWikiLogo) that is supposed to customize the logo of a test project by creating a page named MediaWiki:Incubator-logo-wx-xxx with the file name of a logo for that test wiki. However, that function is not working in any skin. Line 933 in the code has a FIXME that says "This really shouldn't be writing to site config like this (and certainly not through globals).".

The feature is practically unknown, and is used (or attempted to be used) very little – only three pages match the required page name pattern.

In order to test it, you have to add ?testwiki=wx/xxx to the URL and be on the test wiki itself, so with such a limited scope, this malfunction may have gone unreported for years.

Given that (a) the function does things in the wrong way and (b) it has very little (attempted) use, I vote that we just remove the function from the extension altogether, in favour of handling it with on-wiki JS instead. Any objections? Ping @MF-Warburg @Sotiale @Hydriz @Ebe123