gtk:text-tag-accumulative-margin (object)

object -- a gtk:text-tag object
setting -- a boolean whether the margins accumulate

The accessor for the accumulative-margin slot of the gtk:text-tag class gets or sets whether the margins accumulate or override each other. When set to true the margins of this tag are added to the margins of any other non-accumulative margins present. When set to false the margins override one another, the default.