Allow for "random access" undos

<!-- ⚠️⚠️ Do Not Delete This! feature_request_template ⚠️⚠️ --> <!-- Please read our Rules of Conduct: https://opensource.microsoft.com/codeofconduct/ --> <!-- Please search existing issues to avoid creating duplicates. --> Refs: https://github.com/microsoft/vscode/issues/99159 > The undo fails regardless of the change made in the other file. I wonder if VS Code could be smart enough to see that the range effected by the edit/undo wasn't changed, and be able to handle the rename (even line-level detection would probably work)