@Override
	public void disable() {
		service.shutdownNow();
		setDisable(true);
		tree.setRoot(null);
	}
@param item
		Item to check against.
@param child
		Item to add.

@return {@code true} when no cycles are detected.
recaf-ui/src/main/java/software/coley/recaf/ui/pane/editing/tabs/InheritancePane.java