message: Initialize `insertTextMode`
diff: @@ -1601,6 +1601,7 @@ class CompletionItemFeature extends TextDocumentFeature<CompletionOptions, Compl
  insertTextModeSupport: { valueSet: [InsertTextMode.asIs, InsertTextMode.adjustIndentation] },
  labelDetailsSupport: true
  };
  + completion.insertTextMode = InsertTextMode.adjustIndentation;
  completion.completionItemKind = { valueSet: SupportedCompletionItemKinds };
  }
  