Center clock: fixed overlapping with notification icons
When IconMerger decides whether to hide additional icons and show "more icons"
button depends also on whether there's a centered clock occupying space
Center clock icon overlapping: we forgot about data traffic monitor
TODO: still requires adjustments in one specific case: when traffic
meter is positioned on the left. It dynamically changes the size of icon
merger view while traffic meter values change. Max icon merger width
measurement should take this into account