* From the error dialog you are able to back out of scanning or try again. Adds English localization for this message.
Adds an extra flag in OWSQRCodeScanningViewController to make sure that we don’t handle captureResults when capture is disabled (this was racing before because the call to [capture stop] is async and that was causing the cancel case to present the error dialog multiple times.
Fixes Signal-iOS#1347
* Fixes appearance of race with starting capture
Also marks the capture variable as atomic since it is accessed on
multiple threads.
// FREEBIE
bbfffdf79f
