Handle bootup in background tab edge case #129
Merged
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@xg-wang recently discovered an edge case where by:
Spaniel will fire Impression events in both Safari and Firefox. It is currently unknown why this doesn't happen in Chrome.
Previously, Spaniel assumes that the app is visible (and changes this state in response to the browsers visibilitychange event).
This PR ensures that Spaniel does not assume the app is visible.