It took me a while, but I think this is a tool to automatically remind you to commit your work after making [20] writes. It is a plugin for vim.
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I thought it was clear enough from just the first sentence after the image: "Set the number of writes without committing before the message is shown".
Anyways, this is a cute idea but as someone who compulsive hits save after practically every edit (i.e. after most transitions from insert to normal mode), this wouldn't be very helpful.