@Override
	public GTreeFilterProvider copy(GTree newTree) {
		// For now, we shouldn't need to copy the secondary filter.  It's current uses are to not
		// change the filter once it has been created.
		SecondaryTreeFilterProvider newProvider =
			new SecondaryTreeFilterProvider(newTree, secondaryFilter);
		return newProvider;
	}
A filter that allows for an additional second filter.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/actions/SecondaryTreeFilterProvider.java