Since the patch is more than just a few lines, may I ask you to file a CLA?

See also https://github.com/qos-ch/logback/blob/master/src/main/clas/signed-clas.txt

BTW, the CLA can be sent to me directly by email. A scanned copy on two separate pages is fine but please make sure that the images render reasonably well when printed on a laser printer. Images taken by cellphone cameras often render as a large gray smudge when printed.