[FEAT] Hide content when multi-tasking

[bolismauro]

Is your feature request related to a problem? Please describe it.
iOS takes and stores (multiple) screenshots of the app in the filesystem to implement the multi-tasking functionality. We should hide the UI when moving from foreground to background.

Describe the solution you'd like
The app should hide the content to prevent the screenshot from capturing sensible information

[macteo]

As the application can be launched in any moment by the user or the person handling the unlocked phone, this improvement won't add any security or privacy benefit.

It's a common requirement for applications that include a login or biometric protection with short lived sessions. This is not the case.

[bolismauro]

We have been asked to add it to also prevent low-level malware from accessing the stored screenshots. I do not have a strong opinion on whether the value added is significant, but it will not hurt either! So, here you go :)

[macteo]

Understood, I've been asked meaningless changes during vulnerability assessments too. Don't worry. Go on!