...so an external action like hiding widgets with widclkinfo can
unfocus the clock info.
This always decrements Bangle.CLKINFO_FOCUS,
so in the future we should only call force_blur if we know the Clock
Info is focused. We could provide a different function ensure_blur.

This can help widgets, such as widclkinfo, know when they are on
screen.

TODO: disable these changes when widget_utils are not being used.

Use new (prototype) widget_utils events to blur and set offscreen the
clock info when the widgets are hidden. This prevents activating or
further interacting with the widclkinfo.

…r calls