protected void addComponent(FieldLocation loc, Component comp) {
		loc = new FieldLocation(loc.getIndex(), loc.getFieldNum());

		componentsByLocation.put(loc, comp);
		locationsByComponent.put(comp, loc);
	}
Add a component to be position over the given location

@param loc the location of the field to occlude
@param comp the component to be placed over the field
Ghidra/Framework/Docking/src/main/java/docking/widgets/fieldpanel/FieldPanelOverLayoutManager.java