Synopsys   : FILTER_SHOWN(x)

Defined in : /sys/filter_funs.h

Description: This filter returns all objects that are visible, i.e. that
             are not no_show. It checks the query_no_show() in the objects.
Arguments  : object *x - the array with objects to filter.
Returns    : object *  - an array with only visible objects in it.
