Currently, for HomeScreen checking the other application visibility on, visible signal is broadcasted on purpose. But the visible signal should be only sent to the application which changed to visible.

This is strange point.

In other hand, like HomeScreen, there are some applications which needs the visibility of other applications turns on.

So add new event to Window Manager.

This signal means the visible applications like here.

{ "event":"windowmanager\/xxxx", "data":

, }

Then visible signal should be sent for app itself.

The event name is "screen_updated" in my opinion currently.