public void notifySectionItemRemoved(int sectionIndex, int itemIndex) {
        if (sections == null) {
            buildSectionIndex();
            notifyAllSectionsDataSetChanged();
        } else {
            buildSectionIndex();
            Section section = this.sections.get(sectionIndex);

            int offset = itemIndex;
            if (section.hasHeader) {
                offset += 2;
            }
            notifyItemRemoved(section.adapterPosition + offset);
        }

        updateSectionItemRangeSelectionState(sectionIndex, itemIndex, -1);
    }
Notify that an item has been removed from a section
Never directly call notifyItemRemoved

@param sectionIndex index of the section
@param itemIndex    index of the item in the section where 0 is the first position in the section
android/modules/module_common/src/main/java/github/tornaco/android/thanos/widget/section/SectioningAdapter.java