It came from Paranoia
Well, more like +Paranoid Android
to be exact.
Ever been on a roll in Fruit Ninja and accidentally hit the home soft-button while ferociously slicing an orange? No? Well pretend you have; this will fix that.
Selectively hide the status bar and navigation bar for those pesky not-so-fullscreen apps!
Major shout-out to the PA team, Paul Beeler, Dan Symonds and all the reviewers who chimed in on Gerrit. This one almost didn't make it in, and definitely wouldn't have without the code and use-ability fixes - 18 patchsets well spent!