Who undoes the undoers

Just as there is a ticking bomb built into cut/⌘X – if you cut something, and then cut something else again without a paste in between, you overwrite the clipboard without any way to bring it back – there is another one that awaits you when you use undo/⌘Z. Here’s a typical undo chain, illustrated using Photoshop’s classic interface. You can do things, then undo into the past with ⌘Z to your heart’s content, then zipline back to the present via redo’s ⌘⇧Z: But if you go far into the undo history and do something then – accidentally or intentionally – poof! Your entire undo stack, no matter how precious and storied it was, evaporates in an instant: And it’s not even Back to the Future II rules where you can at least go back to the original separation moment and still get the better future for free… …no, the entire original undo stack is gone. The most popular solution for the cut problem, inasmuch as it really needs one, is a clipboard manager. Clipboard managers only move forward in…