src/vs/editor/browser/widget/codeEditorWidget.ts/EditorDecorationsCollection/getRange
class EditorDecorationsCollection:	public getRange(index: number): Range | null {
		if (!this._editor.hasModel()) {
			return null;
		}
		if (index >= this._decorationIds.length) {
			return null;
		}
		return this._editor.getModel().getDecorationRange(this._decorationIds[index]);
	}