Please see the attached image. After selecting any of the three items in that toolbar list, the persistance checkbox will vanish. I noticed that many months ago and expected a discrete fix. Unfortunately, it’s still an unexpected behavior. Now it’s not a real problem, I just want to report it.
I’m using Slice built from git on Linux (KDE, Xorg), with the Python 2.7.15 as the only modification, instead of 2.7.13.