non-`file:` URIs in library/userThirdParty settings don't work

my extension generates a LuaLS userThirdParty bundle dynamically from Factorio's doc files (from the local game install, generally). I'm working on trying to switch to using a virtual FS provider for these files instead of cluttering up real workspace-associated folders with them. I've registered as the provider for fmtk: uris, and i can open all the files for the generated bundle in vscode in editor tabs, but LuaLS won't load them as libraries.

I set

"Lua.workspace.userThirdParty": [
        "fmtk:/luals"
    ],

in my settings.json, instead of setting the generated folder path as i had done previously, but LuaLS seems to have completely ignored it.

I also tried

    "Lua.workspace.library": [
        "fmtk:/luals/factorio/library"
    ],

but that also seems to ignore anything that isn't a plain file path.

Inizia riproducendo il problema con il provider di file system virtuale fmtk: e le impostazioni Lua.workspace.userThirdParty e Lua.workspace.library mostrate nel report. Traccia il modo in cui queste impostazioni risolvono i percorsi delle librerie; il lavoro è completo quando gli URI che non sono URI di file vengono caricati come librerie invece di essere ignorati, con un test di regressione che copra questo comportamento.