copy only the visible text?

[summaminutiae]

Is there a way to copy only the visible text from a buffer that has folded portions?

I sometimes use folds to hide noise and make the structure of a file clear, and it would be nice to copy the result for yanking into another buffer.

[summaminutiae]

This method sort of works okay with some cleanup of the results: https://www.emacswiki.org/emacs/OverlaysToText

[mrkkrp]

I'll accept a PR implementing this.