序言中多语和 setotherlanguage 的存在改变了章节标题格式

Question

当我编译 MWE #1 时，我得到了章节标题格式 #1，这正是我想要的样子。

MWE #1 (XeLaTeX):

\documentclass{book}
\usepackage{lipsum}
\usepackage[
    paperwidth=7.5in,
    paperheight=9.25in,
    inner=0.5in,
    outer=0.5in,
    bindingoffset=0.25in,
    top=0.75in,
    bottom=1.25in,
    twoside,
    %showframe
    ]
    {geometry} 

%%%%%%%%%%
\usepackage[compact,pagestyles]{titlesec}

        %changes page numbering to bottom outer
        \newpagestyle{mystyle}{\setfoot[\thepage][][]{}{}                   {\thepage}}
        \pagestyle{mystyle}
        %

    %creates the chapter heading style  
    \titleformat{\chapter}[display]
    {\normalfont\huge\filcenter\bfseries\rmfamily}
    {\titlerule[1pt]%
    \vspace{1pt}%
    \titlerule
    \vspace{1pc}%
    \LARGE\MakeUppercase{\chaptertitlename} \thechapter}
    {1pc}
    {\titlerule
    \vspace{0pc}%
    \footnotesize}
    %
        %changes chapter heading distance from top
        \makeatletter
        \beforetitleunit=1ex\@plus.ex\@minus.2ex
        \makeatother
        \titlespacing*{\chapter}{0pt}{*-2.25}{*2}
        %

    %changes "Chapter" to "Story"   
    \makeatletter
    \renewcommand\@chapapp{Story}
    \makeatother
    %
%%%%%%%%%%

\begin{document}

\chapter{}
\lipsum[1-24]

\end{document}

章节标题格式 #1：

但是当我编译 MWE #2（它在序言中添加expex和命令）时，我得到了章节标题格式 #2。polyglossia

MWE #2 (XeLaTeX):

\documentclass{book}
\usepackage{lipsum}
\usepackage[
    paperwidth=7.5in,
    paperheight=9.25in,
    inner=0.5in,
    outer=0.5in,
    bindingoffset=0.25in,
    top=0.75in,
    bottom=1.25in,
    twoside,
    %showframe
    ]
    {geometry} 

%%%%%%%%%%
\usepackage[compact,pagestyles]{titlesec}

        %changes page numbering to bottom outer
        \newpagestyle{mystyle}{\setfoot[\thepage][][]{}{}                   {\thepage}}
        \pagestyle{mystyle}
        %

    %creates the chapter heading style  
    \titleformat{\chapter}[display]
    {\normalfont\huge\filcenter\bfseries\rmfamily}
    {\titlerule[1pt]%
    \vspace{1pt}%
    \titlerule
    \vspace{1pc}%
    \LARGE\MakeUppercase{\chaptertitlename} \thechapter}
    {1pc}
    {\titlerule
    \vspace{0pc}%
    \footnotesize}
    %
        %changes chapter heading distance from top
        \makeatletter
        \beforetitleunit=1ex\@plus.ex\@minus.2ex
        \makeatother
        \titlespacing*{\chapter}{0pt}{*-2.25}{*2}
        %

    %changes "Chapter" to "Story"   
    \makeatletter
    \renewcommand\@chapapp{Story}
    \makeatother
    %
%%%%%%%%%%

\usepackage{expex}
\usepackage{polyglossia}
    \setdefaultlanguage{english}
    \setotherlanguage{hebrew}
    \newfontfamily\hebrewfont[Script=Hebrew]{Arial}
    \newfontfamily\englishfont{Linux Libertine O}

\begin{document}

\chapter{}
\lipsum[1-24]

\end{document}

章节标题格式#2：

两个 MWE 之间的唯一区别是 之前的六行\begin{document}。

\usepackage{expex}
\usepackage{polyglossia}
    \setdefaultlanguage{english}
    \setotherlanguage{hebrew}
    \newfontfamily\hebrewfont[Script=Hebrew]{Arial}
    \newfontfamily\englishfont{Linux Libertine O}

据我所知，该\setotherlanguage{hebrew}命令导致了问题。发生了什么；为什么polyglossia或会\setotherlanguage影响章节标题格式？我该如何修复它，以便在仍然使用expex和polyglossia包的同时获得章节标题格式 #1？

Answer 1

希伯来语加载 bidi，并且 bidi 修补了大量包和命令 - 除了其他titlesec和标题之外。

加载希伯来语后titlesec 但是前定义章节格式：

\documentclass{book}
\usepackage{lipsum}
\usepackage[
    paperwidth=7.5in,
    paperheight=9.25in,
    inner=0.5in,
    outer=0.5in,
    bindingoffset=0.25in,
    top=0.75in,
    bottom=1.25in,
    twoside,
    %showframe
    ]
    {geometry}

%%%%%%%%%%
\usepackage[compact,pagestyles]{titlesec}

\usepackage{polyglossia}
    \setdefaultlanguage{english}
    \setotherlanguage{hebrew}
    \newfontfamily\hebrewfont[Script=Hebrew]{Arial}
    \newfontfamily\englishfont{Linux Libertine O}



        %changes page numbering to bottom outer
        \newpagestyle{mystyle}{\setfoot[\thepage][][]{}{}                   {\thepage}}
        \pagestyle{mystyle}
        %

    %creates the chapter heading style
    \titleformat{\chapter}[display]
    {\normalfont\huge\filcenter\bfseries\rmfamily}
    {\titlerule[1pt]%
    \vspace{1pt}%
    \titlerule
    \vspace{1pc}%
    \LARGE\MakeUppercase{\chaptertitlename} \thechapter}
    {1pc}
    {\titlerule
    \vspace{0pc}%
    \footnotesize}
    %
        %changes chapter heading distance from top
        \makeatletter
        \beforetitleunit=1ex\@plus.ex\@minus.2ex
        \makeatother
        \titlespacing*{\chapter}{0pt}{*-2.25}{*2}
        %

    %changes "Chapter" to "Story"
    \makeatletter
    \renewcommand\@chapapp{Story}
    \makeatother
    %
%%%%%%%%%%

\usepackage{expex}




\begin{document}

\chapter{}
\lipsum[1-24]

\end{document}