SetGroupModule checks for visible  elements
SetGroupModule checks for visible  elements

The SetGroupModule now checks not only for whether the max number of children
has been reached, but also for whether all the current children are visible.

[endlessm/eos-sdk#3907]

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib