static _firstLineNumberInRange(model, range, count) {
        let startLineNumber = range.startLineNumber;
        if (range.startColumn !== model.getLineMinColumn(startLineNumber)) {
            // Move on to the second line if the first line start is not included in the range
            startLineNumber++;
        }
        return Math.min(range.endLineNumber, startLineNumber + count - 1);
    }
Find the nth line start included in the range (from the start).