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

首先，按照列出的 Visual Studio Code 步骤并使用具有自定义语法的插件来复现故障。将行为与提供的 myLog.txt 进行比较，包括 React LSP client 报告。对于使用插件定义语法的文件，格式化能够应用预期的缩进，即表示完成。