[question] What is the undo sequence?

Hi,

I'm working back on note+ (I finally pushed a fix yesterday):


And I don't really understand how **undo** "works" on the frontend and if we can "subscribe" to it?

I just got a report (no time to test it properly yet) about the DOM used for rendering the markdown disappearing on undo and recall seeing a "tick" update on each nodes when issuing undo which made me wonder about the whole system and if custom nodes could/should care

Thanks

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-4108-question-What-is-the-undo-sequence-20c6d73d365081e38fcefa550d8bf0a5) by [Unito](https://www.unito.io)