Add a toggle to disable FLAG SECURE

[BasedJellyfish11]

issue: GrapheneOS/os-issue-tracker#664

Adds a setting to developer options to disable flag secure globally. Actual setting is implemented in GrapheneOS/platform_packages_apps_Settings#411

[thestinger]

We only want to override disabling screenshots instead of the other parts of it.

[BasedJellyfish11]

AFAIK flag secure is only used for screenshots (and casting, which seems like the same use case)

https://developer.android.com/security/fraud-prevention/activities

FLAG_SECURE

FLAG_SECURE is a Window flag that tells Android not to allow screenshots or to display the window view on a non-secure display (such as Casting the screen). This is useful for applications that need to protect sensitive information, like banking apps or password managers. When a window is flagged with FLAG_SECURE, Android prevents screenshots from being taken and prevents the window from being displayed on a non-secure display, such as a TV or projector. This helps to protect the information that is being displayed in the window from being accessed by unauthorized people.

Is the ask to decouple the setting from the casting functionality? Or just a double check

[thestinger]

It does change other things including it not generating thumbnails for recent apps.

[BasedJellyfish11]

Sounds good, let me look into what needs to change

[BasedJellyfish11]

Should be good now