src/vs/editor/common/model/textModel.ts/DecorationsTrees/_ensureNodesHaveRanges
class DecorationsTrees:	private _ensureNodesHaveRanges(host: IDecorationsTreesHost, nodes: IntervalNode[]): model.IModelDecoration[] {
		for (const node of nodes) {
			if (node.range === null) {
				node.range = host.getRangeAt(node.cachedAbsoluteStart, node.cachedAbsoluteEnd);
			}
		}
		return <model.IModelDecoration[]>nodes;
	}