An option to have a snapshot taken with every adjustment. Another way this could work is for AE to take this snapshot with every change and use it as the first thing you see when you hit undo once. As soon as you make a change again of course this snapshot image goes away. I just often work on projects that are so dense a single change can take 20 seconds to refresh and having to remember to click the snapshot every time is annoying.
Thanks adobe!
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