Add showing typo in error message

[adamryman]

I wanted to see what key I hit by mistake.

Up to change implementation if desired, I am liking the result though.

Image of what it looks like in slow mode.

[barnumbirr]

This is a really useful addition. @pb- any plans of merging this?

[adamryman]

@pb- I am so excited to see there have been more pull requests since I worked on this a few years ago!

Do you think we could merge this pull request?

[adamryman]

I just rebased on top of master.

I'm not fully sure what to do about how the actual / expected looks.

Input appreciated.

[adamryman]

@pb- How can we get this merged? What changes would you like to see?

[pb-]

@adamryman apologies for responding way too late, you probably already gave up on this. Just in case not - I'm wondering if the mismatch message (expected/actual) is supposed to go away after the penalty delay? It seems that it sticks around, which is a bit confusing.