Cannot get didChange with incremental changes to work

[NGPixel]

When sending the textDocument/didChange with the full document text (without range and rangeLength properties), the content gets properly updated in Lemminx. Calling something like textDocument/formatting afterwards correctly returns the proper changes.

However, if I try to use incremental sync, adding the range (and optionally the rangeLength) properties and only set the text that changed, it gets completely ignored. Calling something like textDocument/formatting assumes the very first version of the document and not the changes that were applied afterwards.

Is there something obvious I'm missing that needs to be done for incremental changes to be supported in Lemminx?

For reference, here's an example request for an incremental change:

{
  "jsonrpc": "2.0",
  "method": "textDocument/didChange",
  "params": {
    "textDocument": {
      "uri": "file:///c%3A%5CUsers%5Cnick%5Ctest%5Cdraft-07.xml",
      "version": 1
    },
    "contentChanges": [
      {
        "range": {
          "start": {
            "line": 26,
            "character": 4
          },
          "end": {
            "line": 26,
            "character": 4
          }
        },
        "rangeLength": 0,
        "text": "Introduction"
      }
    ]
  }
}

This is the lsp lifecycle I have:

• --> initialize
• <-- server capabilities (with "textDocumentSync":2)
• --> initialized
• --> textDocument/didOpen
• <-- textDocument/publishDiagnostics
• --> textDocument/didChange

[angelozerr]

I suggest you that you install vscode xml and you enable trace and study the traces since it is working with incremental support in vscode

[buhl-tax-service]

@NGPixel Did you fix the problem? I have the same issue.

[NGPixel]

@buhl-tax-service I don't recall what exactly was breaking it, but here's my current code that works:

https://github.com/ietf-tools/editor/blob/f4b82c127ae5bf3e6689f5e4dd29e259da0dac56/src/stores/docs.js#L210-L250