We treat wake up requests the same as user activity, as in general the two behave the same: Turn on the screen and reset the idle watch until the system becomes idle again.
The big exception is when the screen isn't locked yet. In that case user activity should interrupt the automatic screen lock, but a request to wake-up the screen (like showing a notification) should not.
Address this by ignoring wake-up requests while the screen shield isn't active, as we can expect the screen to still be turned on at that point.
Fixes #5719 (closed)