public boolean isSectionFooterSelected(int sectionIndex) {
        SectionSelectionState state = getSectionSelectionState(sectionIndex);
        return state.section || state.footer;
    }
Check whether footer of a section is selected, or if the entire section is selected

@param sectionIndex section index
@return true if the footer is selected
android/modules/module_common/src/main/java/github/tornaco/android/thanos/widget/section/SectioningAdapter.java