Re: [w3c/editing] Removal of browser built-in Undo stack functionality from contenteditable (#150)

Disabling undo/redo is possible but enabling undo/redo would require each app inserting an undo item into the browser's undo stack (NSUndoManager) on Safari (both Mac & iOS).  This is precisely why the [old undo manager spec](https://dvcs.w3.org/hg/undomanager/raw-file/tip/undomanager.html), which Gecko implemented at some point, had an explicit mechanism to insert and remove undo entries.

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