Complete bogus - but lets play: If you were the NSA; why would you even hint to the user that you were taking screenshots? Its not like the blink animation is tucked away from software control.
As I understood it - there were certain apps that were captured in the past. This was so that when the app loaded it had the previous state shown as quickly as possible, and it would then refresh.
My point was I am noticing this flashing screen cap anim on literally EVERY screen change... this does not make sense to me and I am wondering why the device does this.
Finally, I surmise that if it actually IS doing these caps, that if one COULD get access to them one could then build a pretty clear session history.
Again, I said it was a simple suspicion. I have no idea if this is actually happening; but the device seems to be revealing the caps happening... but I am not so sure.
The iPhone 4 runs iOS 7 terribly and more likely you are seeing some graphics stuttering from the (albeit limited on that device) new iOS 7 fade/transition animations.
Not to mention that the screen flash while a screenshot is being taken is a usability feature and is there to help us know when a screenshot has been successfully taken. I know there are tweaks on Cydia that allow screen recordings, so why are the NSA messing about taking screenshots of some unimportant (no offense, i mean it in a national security sense) guy?
tl;dr your iPhone 4 is struggling with iOS 7 and probably has some redraw problems, most likely no one is taking screenshots of you while you're switching apps.
My question is: Does the iOS device, in fact, take a screenshot of every single transition?
everyone seems to miss my question, thus I must be posing it poorly.
What I said again, simply, was that:
I knew that some transitions had a screen capped to allow for a faster, subjective, transition to the user... a UX cheat.
However, I noticed that my iOS7 device APPEARS to be doing this on EVERY transition... Is it really capping, or, as you smartly suggest; the iPhone 4 is a POS that struggles in the anims for each transition.
Finally, I was just surmising that should the device, indeed, take a screen for every transition; this could be a sweet exploit in rebuilding session actions for any user of the device.
Apologies, your initial comment sounded like you thought you were being targeted by the NSA or something.