The first ticket i sent for this was deleted without any message. Any article i try to edit has this. If i copy some text and paste over something, that action cannot be undone.
If you use ctrl+c to copy some text and then ctrl+v, the paste action cannot be undone, pressing ctrl+z will undo everything except the paste action.
Hey there thank you for reporting! We are aware of this issue - we are currently working on the development of a completely new version of the editor that will be released very soon and will completely fix this problem by also adding about a metric tonne of new features to the editor. I am will close this as a "Won't fix" but keep in mind that we putting all our efforts at actually fixing it in a much better way. (You can always respond here if you need to talk to me)