Code formatting doesn't work when plugin is used.

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Windows

What is the issue affecting?

Formatting, Plugins

Expected Behaviour

Code formatting should work when plugin is used.

Actual Behaviour

Code formatting doesn't work when plugin is used.

Reproduction steps

1. Create plugin and set the appropriate settings as described here https://github.com/LuaLS/lua-language-server/wiki/Plugins
2. Use it (create some file and use custom syntax)
3. Make some ugly indentation.
4. Alt+shift+f (Format document)
5. The code has not been formatted.
   

Additional Notes

As you can see the error occurs in VSC but I use LSP mainly as a server for my own client in React and the error also occurs there.

Log File

myLog.txt

Inizia riproducendo il problema seguendo i passaggi indicati per Visual Studio Code e usando un plugin con sintassi personalizzata. Confronta il comportamento con il myLog.txt fornito, incluso il report del React LSP client. Il lavoro è completato quando la formattazione applica l'indentazione prevista ai file che usano una sintassi definita dal plugin.