To my knowledge there are three unfolding plugins available.
Thanks to @slbaumgartner, my favorite, jf_unfold, was recently updated to work in SU 2016 and newer.
Thanks to @jim_foltz for permission to re-release it to the community.
jf_unfold_2018 prgsbar.rbz (4.2 KB)
The .rbz file includes the following:
• jf_unfoldtool_2018.rb
• progressbar.rb
EDIT: Oops … thanks for noticing that @DaveR