void unRegisterNavigatable() {
		NavigatableRegistry.unregisterNavigatable(tool, this);
		for (NavigatableRemovalListener listener : navigationListeners) {
			listener.navigatableRemoved(this);
		}
	}
Gets the text of the current {@link ProgramSelection}

@return the text
Ghidra/Features/ByteViewer/src/main/java/ghidra/app/plugin/core/byteviewer/ProgramByteViewerComponentProvider.java