I recently started developing the previous “inactive_panes.py” feature from Origami (I don’t think it had a special name) separately because it was abandoned due to numerous errors and problems with ST’s API. I didn’t run into these problems myself though after update a bit of the source so I kept using it. While it is indeed a pita to debug and spot errors I really got used to this feature and could get myself together to distribute it.
Repo, source and images here: github.com/SublimeText/InactivePanes
Available from Package Control as “InactivePanes”.
Screenshot
Please report any errors or issues you have so I can fix them.