public int getStartingFieldNum() {
			return startingFieldNum;
		}
Returns the overall field number of the first field in this layout. For example, 
the first layout would have a starting field number of 0 and if it has 5 fields, the
next layout would have a starting field number of 5 and so on.
@return the overall field number of the first field in this layout.
Ghidra/Framework/Docking/src/main/java/docking/widgets/fieldpanel/AccessibleFieldPanelDelegate.java