src/vs/editor/common/viewLayout/linesLayout.ts/LinesLayout/_findFirstWhitespaceAfterLineNumber
class LinesLayout:	private _findFirstWhitespaceAfterLineNumber(lineNumber: number): number {
		lineNumber = lineNumber | 0;

		const lastWhitespaceBeforeLineNumber = this._findLastWhitespaceBeforeLineNumber(lineNumber);
		const firstWhitespaceAfterLineNumber = lastWhitespaceBeforeLineNumber + 1;

		if (firstWhitespaceAfterLineNumber < this._arr.length) {
			return firstWhitespaceAfterLineNumber;
		}

		return -1;
	}