Add the ability to set a Primary variant for the split button per this core PR: https://github.com/patternfly/patternfly/pull/4508. This should only be supported for the [Split-button action](https://www.patternfly.org/v4/components/dropdown#split-button-action) variant.
Add the ability to set a Primary variant for the split button per this core PR: patternfly/patternfly#4508. This should only be supported for the Split-button action variant.