我想\usepackage{fancyhdr}在文档的页眉/页脚中列出段落编号。大多数情况下，这种方法都行得通，但是当新页面以段落开头时，上一页也会列出该编号。下面的屏幕截图显示第 8 页：列出了第 12-16 段，但实际上只有第 12-15 段出现在页面上。有什么办法可以解决这个问题吗？
这是 MWE：
\documentclass{book}
\usepackage{lipsum}
\setlipsumdefault{1}
\usepackage{titlesec}
% fancy headings as defined by the OP except we need to be more careful
% with plain headings
\usepackage{fancyhdr}
\fancypagestyle{plain}{% need to reset \firstpara on pages without headers
\fancyhf{} % clear all header and footer fields
\renewcommand{\headrulewidth}{0pt}
\fancyfoot[C]{\bfseries \thepage}
\xdef\firstpara{\lastpara}
}
\pagestyle{fancy}
\fancyhf{}
\fancyhead[LE,RO]{\thepage}
\fancyhead[CO]{\rightmark}
\renewcommand{\sectionmark}[1]{%
\markright{#1}%
\def\firstpara{1}\def\lastpara{1}% reset counters each section
}
\fancyhead[CE]{\leftmark}
\renewcommand{\chaptermark}[1]{\markboth{#1}{}}
\fancyhead[LO,RE]{\thesection.\theparagraph}
\newcommand{\sectionbreak}{\clearpage\thispagestyle{plain}}
\renewcommand\thesection{\arabic{section}}
% now the macros for tracking the paragraph numbers
\def\firstpara{1}% set to 1 by default
\def\lastpara{1}% set to 1 by default
\def\setparagraph#1-#2-#3|{%
% if \firstpara=0 => new page => set \firstpara
\ifnum\firstpara=0\def\firstpara{#1}\fi%
% if #2=0 => only #1 is meaningful to set \lastpara to this
% otherwise use #2
\ifnum#2=0\def\lastpara{#1}\else\def\lastpara{#2}\fi%
}
\def\paragraph#1{\textbf{#1}\space%
\setparagraph#1-0-|%
}
\def\theparagraph{%
% if \firstpara=\lastpara print only \firstpara otherwise print a range
\ifnum\firstpara=\lastpara\firstpara\else\firstpara--\lastpara\fi
% reset firstpara and lastpara
\xdef\firstpara{\lastpara}%
%\let\lastpara\relax%
}
% back to the MWe
\begin{document}
\null
\pagestyle{empty}
\newpage
\newpage
\pagestyle{fancy}
\chapter{A Chapter}
\section{First Section}
\paragraph{1}\lipsum
\paragraph{2}\lipsum
\paragraph{3-5}\lipsum
\paragraph{6}\lipsum
\paragraph{7-17}\lipsum
\paragraph{18}\lipsum
\section{Second Section}
\paragraph{1}\lipsum
\paragraph{2}\lipsum
\paragraph{3}\lipsum
\paragraph{4}\lipsum
\paragraph{5}\lipsum
\paragraph{6}\lipsum
\paragraph{7}\lipsum
\paragraph{8}\lipsum
\paragraph{9}\lipsum
\paragraph{10}\lipsum
\paragraph{11}\lipsum
\paragraph{12}\lipsum
\paragraph{13}\lipsum
\paragraph{14}\lipsum
\paragraph{15}\lipsum
Just another paragraph withou number.
\paragraph{16}\lipsum
\paragraph{17}\lipsum
\paragraph{18}\lipsum
\paragraph{19}\lipsum
\paragraph{20}\lipsum
\end{document}