Often times I'm still reviewing pull requests that have been merged already. It would be nice if there would an approve button.
Currently it looks like this:

Maybe a button next to Submit review that is called Approve and when clicked will insert :+1: into the textfield and hit on the submit review button.
@vanniktech you cant, once its merged you cant approve anymore
Yes. But you can workaround that by inserting :+1: and clicking on submit review.
Two issues with this:
Thanks for the suggestion, but we're going to pass on this :)
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Two issues with this: