Go dormant before termination

[1ec5]

This is a speculative fix for #1460, #1509, and #1680 per #1460 (comment), building off the work in #1451. Once we get UIApplicationWillTerminateNotification, it’s unlikely that there will be any need to service further requests for rendering, programmatic viewport manipulation, or gesture recognition.

I’ll keep an eye on our HockeyApp stats to see if #1460 goes away at least.

/cc @incanus @friedbunny

[1ec5]

@picciano @mb12 @robipresotto, feel free to take these changes for a spin. Hopefully we can get these mystery crashes to stop mucking up everyone’s analytics! 👊→🌳

[mb12]

#1509 consistently reproducible. I have added steps to reproduce it in the issue itself.

[1ec5]

@mb12, ah, that’s the alpha transparency one. Got a little ahead of myself.

[1ec5]

Another attempt in #1821.

[incanus]

Should we roll this back just to simplify a bit?

[1ec5]

@incanus, I think handling will-terminate is correct but possibly unnecessary. If you think it’ll simplify the code (less redundancy), we can roll this bug. But let’s wait until #1821 shakes out before adding another variable.