disable wakelock on newer iOS

[machenmusik]

Description:
Old wakelock code causes intermittent failures on iOS, see immersive-web/webvr-polyfill#354 and #4459.

Changes proposed:
Don't enable wakelock if on newer iOS.

[machenmusik]

Note that is it not currently possible to override AFRAME's desired polyfill configuration.

[dmarcos]

Is there any wake lock solution that works on all versions of iOS?

[machenmusik]

I don't know, but this was causing sporadic but eventual whiteout AR crashes on WebXR Viewer, and I don't think it works on mobile Safari anymore either.

[dmarcos]

The WebXR Viewer has not been updated since June 2019. Probably better to use Chrome as baseline for WebXR AR features

[machenmusik]

Sadly, my understanding is that it's still the only functional AR browser for iOS.
The PR is conditioned on newer iOS since those are where the wakelock is broken.

[dmarcos]

Not sure how much we should accommodate since it doesn’t follow the spec progress. If the project gets picked back up we can look to support.

[machenmusik]

My understanding is they are picking it up via webxr branch of firefox-ios. In any event, iOS Safari also fails with the current wakelock, so it may be more important in that regard. Are you sure you want to close?

[machenmusik]

see https://github.com/mozilla-mobile/firefox-ios/tree/webxr