protected override void Invoke(ICodeAction action)
{
var snapshot = _document.CurrentSnapshot;
var oldText = snapshot.ToSourceText();
var syntaxTree = action.GetEdit();
var newText = syntaxTree.Text;
var changes = newText.GetChanges(oldText);
var textChangeOptions = new TextChangeOptions();
textChangeOptions.RetainSelection = true;
var textChange = _document.CreateTextChange(TextChangeTypes.Custom, textChangeOptions);
var currentText = oldText;
foreach (var change in changes)
{
var range = currentText.ToRange(change.Span);
textChange.ReplaceText(range, change.NewText);
currentText = currentText.WithChanges(change);
}
textChange.Apply();
}