src/vs/workbench/api/common/extHostNotebookConcatDocument.ts/ExtHostNotebookConcatDocument/validateRange
class ExtHostNotebookConcatDocument:	validateRange(range: vscode.Range): vscode.Range {
		const start = this.validatePosition(range.start);
		const end = this.validatePosition(range.end);
		return range.with(start, end);
	}