AboutEmacs’s undo system allows you to recover any past state of a buffer. To do this, Emacs treats “undo” itself as just another editing action that can be undone. This can be confusing and difficult to use. If you make an edit while undoing multiple changes, you “break the undo chain”. To get back to where you were, you have to undo all the undos you just did, then undo all the changes you’d alr