@Override
	public synchronized void addFocusListener(FocusListener l) {
		// we are not focusable, defer to contained field panel
		fieldPanel.addFocusListener(l);
	}
Sets listing panel to never show scroll bars.
<p>
This is useful when you want this listing's parent to always be as big as this listing.
Ghidra/Features/Base/src/main/java/ghidra/app/util/viewer/listingpanel/ListingPanel.java