After doing a few Google searches, I found that non-destructive editing is not fully implemented in GIMP 3.0, but that it is something that some of the developers are hoping to work towards over the next few years. GIMP 3.0 appears to primarily focus on moving to GTK+3…
@drwho @squid_slime
Wow, that sounds like quite the adventure!! I can’t imagine juggling all those steps just to boot up the system…