ANDROID LIFECYCLE REWORK: GLView.onResume() IS NOW TAKING WINDOW-FOCUS IN COUNT (NO GAIN ON NEXUS 7, V4.2.2, BUT ON XOOM 1, V3.1: SKETCH IS NOT RESTARTED DURING LOCK-SCREEN WHEN BACK FROM SLEEP) — NEXT STEPS: TRY AN ALTERNATIVE APPROACH, AS THE WINDOW-FOCUS EVENTS ARE NOT RELIABLE AS WELL