src/vs/editor/browser/controller/textAreaState.ts/PagedScreenReaderStrategy/_getRangeForPage
class PagedScreenReaderStrategy:	private static _getRangeForPage(page: number, linesPerPage: number): Range {
		const offset = page * linesPerPage;
		const startLineNumber = offset + 1;
		const endLineNumber = offset + linesPerPage;
		return new Range(startLineNumber, 1, endLineNumber + 1, 1);
	}