prosemirror-math

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I'm using prosemirror-math as an in-browser text editor. For this it would be useful to have someway to undo changes --- e.g. "[esc]"-then-"u" or "[ctrl]"-and-"z". One way to do this is to maintain a stack for the history. Maintaining such a redundant history can in principle cost lots of space, but since these are human-generated strings of text, that might be a negligible event.

Actually, ProseMirror has built-in support for history, so this is just a matter of enabling the history plugin on the demo page. I'll add it in!