protected void addPreSortedChild(@Nonnull TreeItem<T> item) {
		synchronized (sourceChildren) {
			sourceChildren.add(item);
			if (item instanceof FilterableTreeItem<?> filterableItem)
				filterableItem.sourceParent.set(Unchecked.cast(this));
		}
	}
Add an unfiltered unsorted child to this item.

@param item
		Child item to add.
recaf-ui/src/main/java/software/coley/recaf/ui/control/tree/FilterableTreeItem.java