@Override
	public void domainObjectChanged(DomainObjectChangedEvent ev) {
		if (ev.contains(INT_PROPERTY_MAP_ADDED, INT_PROPERTY_MAP_REMOVED)) {
			colorMap = program.getIntRangeMap(COLOR_PROPERTY_NAME);
		}

	}
Default {@link BackgroundColorModel} for the ListingPanel where the color returned
for an index is based on that corresponding address having a color set in the
program's database. (You can "paint" colors over address ranges).
Ghidra/Features/Base/src/main/java/ghidra/app/util/viewer/listingpanel/PropertyBasedBackgroundColorModel.java