public int getFieldNum(Point p) {
			return layout.getFieldIndex(p.x, p.y) + startingFieldNum;
		}
Returns the overall field number of the field containing the given point.
@param p the point to find the field for
@return the overall field number of the field containing the given point.
Ghidra/Framework/Docking/src/main/java/docking/widgets/fieldpanel/AccessibleFieldPanelDelegate.java