I've come across this bug whilst using the Dart language server, which 
is included in the Dart SDK.

Steps to reproduce bug:

- Create example Dart project using Flutter: `flutter create hello_world`

- Open `hello_world/lib/main.dart` in Emacs

- Start eglot with `M-x eglot RET`

- Make a rudimentary change in the file; ex. add a line break

- Save with `C-x C-s`

- Following text appears in the minibuffer area: `[eglot] Server reports 
(type=1): Unknown method textDocument/didSave`

Related bug reports (on GitHub): 
https://github.com/dart-lang/sdk/issues/36464 and 
https://github.com/microsoft/language-server-protocol/issues/288

I am using eglot 1.11 (from ELPA) with Emacs 28.2 on Arch.

Thanks in advance.

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