`Blame parent` link in blame view about refined-github

[sindresorhus]

For reference, here's how it looks now:

[paulmolluzzo]

Some sort of annotated screenshot would clarify this ticket a bit.

[sindresorhus]

In the blame view, like https://github.com/sindresorhus/refined-github/blame/master/extension/content.js, I would like to to change the blame view to the parent commit of the one currently on the left side, as I want to know what happened to that piece of code before the commit currently there.

So in the above screenshot I would like an extra link for each blame that says Blame parent and goes to the blame view of the commit before the one referenced.

Is that clear?

[hkdobrev]

I get exactly what you need, because I've wanted that for so long. I will submit a PR in a few minutes if everything goes by plan.