xml.format.tabSize and xml.format.insertSpaces have no effect in Neovim

[on2e]

I am currently trying the lemminx server in Neovim and I'm having a hard time setting the tabSize option. My config looks like this:

settings = {
    xml = {
        format = {
            enabled = true,
            splitAttributes = false,
            spaceBeforeEmptyCloseTag = true,
            insertSpaces = true,
            tabSize = 10,
        },
    },
},

However, when I am formatting an XML file, the effective tabSize is 4, not 10 (or any other value I set). A tab size of 4 and the use of spaces are derived from my Neovim options. These options can been seen in the LSP logs for the lemminx server for formatting requests:

...
[DEBUG][2024-08-25 02:01:32] ...m/lsp/client.lua:676	"LSP[lemminx]"	"client.request"	1	"textDocument/formatting"	{  options = {    insertSpaces = true,    tabSize = 4  },  textDocument = {    uri = "file:///path/to/file.xml"  }}	<function 1>	13
[DEBUG][2024-08-25 02:01:32] .../vim/lsp/rpc.lua:286	"rpc.send"	{  id = 20,  jsonrpc = "2.0",  method = "textDocument/formatting",  params = {    options = {      insertSpaces = true,      tabSize = 4    },    textDocument = {      uri = "file:///path/to/file.xml"    }  }}
...

The xml.format.tabSize and xml.format.insertSpaces values do not end up in the formatting_options table and Neovim uses the global options for these fields, as documented, to format the file.

The options passed by the user in xml.format that are shared with FormattingOptions should override the latter.

I do not currently know if this is a lemminx issue or a Neovim LSP client issue.

The other options set in the xml.format seem to be working.

---

LemMinX: 0.27.1
Neovim: v0.10.0
OS: Ubuntu 22.04.4 LTS