6.27.0 broke the %edit magic

@blink1073

We have a test for that magic in Spyder and it started to fail with 6.27.0.
I checked locally and can confirm that that's the case: the magic works well in 6.26.0 but fails in 6.27.0
My guess is that the problem was introduced by the changes done in PR Extend argument handling of do_execute with cell metadata #1169.

@blink1073, could you take a look at this one? I'd love to help but unfortunately I don't have time to do it right now.

I've yanked the 6.27.0 release, I'll see about adding tests for some magics before releasing again.

Can you point me to your existing tests?

It's this one:

What we do is testing that running %edit foo.py in the console opens foo.py in our editor. I don't know how to test that only in the kernel.

This was actually the offending change, from my linting PR. Path vs str, tricky...

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