private void fireColumnAdded(TableColumnModelEvent e) {
		for (TableColumnModelListener listener : listeners) {
			listener.columnAdded(e);
		}
	}
Recalculates the total combined width of all columns.  Updates the
<code>totalColumnWidth</code> property.
Ghidra/Framework/Docking/src/main/java/docking/widgets/table/GTableColumnModel.java