cmd/gofmt: unaligned end-of-line comments in switch cases

[rillig]

What version of Go are you using (go version)?

go version go1.11.1 windows/amd64

Does this issue reproduce with the latest release?

yes.

What did you do?

https://play.golang.org/p/hMeljDlfiZJ

What did you expect to see?

When I click Format, all end-of-line comments should be aligned in the same column.

What did you see instead?

The first comment is not aligned with the other ones.

[agnivade]

@griesemer

For completeness, it is just between the first case, and the rest of the cases. The later ones are all aligned with each other.