private Duo<ListingDisplay> buildListingDisplays() {
		ListingDisplay leftDisplay =
			new ListingDisplay(tool, owner, listingDiff, comparisonOptions, LEFT);
		ListingDisplay rightDisplay =
			new ListingDisplay(tool, owner, listingDiff, comparisonOptions, RIGHT);

		// make the right format manager always be the same as the left format manager
		leftDisplay.getFormatManager().addFormatModelListener(this);

		leftDisplay.setProgramLocationListener((l, t) -> programLocationChanged(LEFT, l, t));
		rightDisplay.setProgramLocationListener((l, t) -> programLocationChanged(RIGHT, l, t));

		return new Duo<>(leftDisplay, rightDisplay);
	}
Creates a comparison panel with two listings.

@param owner the owner of this panel
@param tool the tool displaying this panel
Ghidra/Features/Base/src/main/java/ghidra/features/base/codecompare/listing/ListingCodeComparisonPanel.java