Setting expandtab to true doesn't affect :set expandtab? / How to check what file last assigned to a neovim option?

[starptr]

In the template init.lua, one of the lines sets expandtab:

opt.expandtab = true

but when I run :set expandtab?, it returns noexpandtab. What could possibly explain this?

[mrcjkb]

Running this without any modifications:

:verbose set expandtab?
  expandtab
        Last set from Lua (run Nvim with -V1 for more details)

There are some options that will set noexpandtab, so I suggest you use :verbose set expandtab? to troubleshoot that.

[starptr]

Thanks for the help! This told me that in my scenario the built-in editorconfig handler was setting it.

For posterity: anyone can repro this and see this behavior:

nix run "github:nix-community/kickstart-nix.nvim" -- -V1 nvim/init.lua
:verbose set expandtab?

or really any lua file such that none of its parent directories contain an editorconfig file. I think neovim's built-in editorconfig plugin will default to setting noexpandtab when it doesn't find an editorconfig file. This sounds like a bug to me but I'm not sure yet.

[mrcjkb]

Are you sure?
There was no .editorconfig file where I tested it.