@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((filter == null) ? 0 : filter.hashCode());
		result = prime * result + ((properties == null) ? 0 : properties.hashCode());
		return result;
	}
A class that allows us to capture the current state of any {@link Filter}.  This state allows
us to tell if the filter has been modified.
Ghidra/Features/VersionTracking/src/main/java/ghidra/feature/vt/gui/filters/FilterState.java