@Nullable
	private static TreeItem<?> getParent(@Nonnull TreeItem<?> item) {
		TreeItem<?> parent = item.getParent();
		if (parent == null && item instanceof FilterableTreeItem<?> filterableItem)
			parent = filterableItem.sourceParentProperty().get();
		return parent;
	}
@param item
		Tree item to get parent of.

@return Parent tree item.
recaf-ui/src/main/java/software/coley/recaf/ui/control/tree/TreeItems.java