Not related to FX envelope changes, but I just noticed a VSTi which produces lots of undo entries by just loading it (and me not doing anything).
https://i.imgur.com/l2rjsaA.gif
http://samcycle.blogspot.de/2011/01/...1-virtual.html
(Synthedit/-maker, I'd guess, dunno if that's relevant)
R5.15pre2 x86, Win 8.1 x64