@Override
	public void modelDataChanged(ListingPanel listingPanel) {
		this.program = listingPanel.getProgram();
		this.indexMap = listingPanel.getAddressIndexMap();
	}
{@link BackgroundColorModel} for coloring the Listing based on the {@link MarkerService}
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/codebrowser/MarkerServiceBackgroundColorModel.java