prawnpdf/prawn-table — pull request #12 by hbrandl (2014-08-18 14:04:10+00:00)
Title: Fixed multi line table headers that involve cells that span multiple columns (fixes #8)

This should fix issue #8.
I wasn't able to come up with a test case for the original issue.
@sandal any idea on how to test this / issue #8 ?