### Context - [X] This issue is not a bug report. *(please use a different template for reporting a bug)* - [X] This issue is not a duplicate of an existing issue. *(please use the [search](https://github.com/microsoft/monaco-editor/issues) to find existing issues)* ### Description The editor api allows to register a listener on the editor creation (`monaco.editor.onDidCreateEditor`), but do not allow to: - register a listener on the diff editor creation - list all editors and diff editors