hasReturned uses app switch state

[imbrian]

Description

hasReturned will return true in the presence of app switch params. If called after an app switch (non-resume) flow, this can call onApprove twice.

• adds appSwitchState to Buttons component
• sets state when hashchange and visibilitychange listeners are added in the app switch flow
• if an app switch flow has started in the current button instance, hasReturned should not return true

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