Merge tag 'v3.39.2' into develop

added support for dirty progressbar thanks to @ritze v3.39.2

# gpg: Signature made Mon Dec 17 01:54:47 2018 CET
# gpg:                using RSA key 149325FD15904E9C4EB89E95E81444E9CE1F695D
# gpg: Good signature from "Rick van Hattem <wolph@wol.ph>" [ultimate]
# gpg:                 aka "[jpeg image of size 9662]" [ultimate]

Author: wolph