false by default.
If new selection doesn't select a feature that is already selected,
if true will let the feature selected,
else will deselect it.
Optional toggleSelection
toggleSelection:undefined | false | true
true by default.
If new selection select a feature that is already selected,
if parameter is true it will deselect the feature,
else will let the feature selected.
false by default. If new selection doesn't select a feature that is already selected, if true will let the feature selected, else will deselect it.