Refactor creation and show dispatch so Notification constructor and showNotification can use it.
Move persistence to ShowInternal.
NotificationStorage calls callback async even when fetching from cache, simply to have similar semantics.
Calls to Notification::Get() are performed async since persistence is now async after being moved to ShowInternal().
Both are in accordance with the spec where the "append to list of notifications" operation is performed in the "show steps" which are performed in parallel from API invocations.
Refactor creation and show dispatch so Notification constructor and showNotification can use it.
Move persistence to ShowInternal.
NotificationStorage calls callback async even when fetching from cache, simply to have similar semantics.
Calls to Notification::Get() are performed async since persistence is now async after being moved to ShowInternal().
Both are in accordance with the spec where the "append to list of notifications" operation is performed in the "show steps" which are performed in parallel from API invocations.