带有定制部分的寡妇和孤儿

Question

在社区的帮助下，我找到了一个自定义sections字幕的解决方案。TeX 似乎对section-title 进行了一些关于如何处理分页符的广泛处理。

\documentclass[a4paper,11pt]{article}
\usepackage[margin=2.5cm]{geometry} % for margins on a A4paper
\usepackage[tracking=true,factor=1100,stretch=10,shrink=10,final]{microtype} % have some better layout of individual chars
\usepackage{fontspec}
\usepackage[shorthands=off,bidi=basic]{babel}
\usepackage{xcolor} % for highlighting AND background images-color!!!
%\usepackage[defaultlines=3,all]{nowidow} % prevents orphans and widows
\usepackage{widows-and-orphans}
\usepackage{setspace} 
\onehalfspacing 
\usepackage{parskip}
\usepackage[raggedright]{titlesec} % to have the section NOT justify, i.e. the lines can be shorter (for linebreak)
\usepackage{keyval}
% Set formats for each heading level
\titleformat*{\section}{\normalsize\bfseries\color{gray}}
\titleformat*{\subsection}{\normalsize\bfseries\color{gray}}
\titleformat*{\subsubsection}{\normalsize\bfseries\color{gray}}
\titlespacing*{\section}{0pt}{*3}{0pt}
\titlespacing*{\subsection}{0pt}{*3}{0pt}
\titlespacing*{\subsubsection}{0pt}{*3}{0pt}
\makeatletter
\define@key{chk}{subtitle}{\def\chk@subtitle{#1}}
\newcommand\sectionLvl[3][]{%
{   \setkeys{chk}{subtitle={},#1}%
    \normalsize\bfseries\color{gray}%required for deeper level
    \ifcase#2\relax\expandafter\chapter\or%section
    \relax\expandafter\section\or%subsection
    \relax\expandafter\subsection\or%subsubsection
    \expandafter\subsubsection
    \fi
    [#3]{#3%check if subtitle exists
        \ifx\chk@subtitle\@empty\relax\else%add subtitle
        \nopagebreak\endgraf\vspace{-0.5\baselineskip}
        \parbox[t]{\linewidth}{%
            \raggedright\normalfont\sffamily%font of subtitel
            \textcolor{gray}{\chk@subtitle}%subtitle itself
        }\endgraf\vspace{-\baselineskip}%
        \fi%end of subtitle
    }
}}
\makeatother

\usepackage{kantlipsum}
\begin{document}
 \sectionLvl[subtitle={Test Subtitle}]{1}{first Kant}
 \kant[1-3]
 \vspace{4.5cm}
\sectionLvl[subtitle={Test Subtitle}]{1}{second Kant}
 \kant[1-4]
sectionLvl[subtitle={Test Subtitle}]{1}{third Kant}
\kant[1-4]

\end{document}

通过上述解决方案，我现在面临的问题是section（带有其副标题）将成为寡妇。

如果我想防止这种情况发生，我想我需要使用一个包。我搜索了有关如何防止寡妇的提示，找到了两个主要包：nowidow和widows-and-orphans。使用widows-and-orphans我没有成功。虽然nowidow看起来很旧，但它正在工作（通过使用defaultlines=3和额外的\nopagebreak）。副作用是我现在至少有 3 行。

有没有办法既能坚持至少 2 行，又能避免一些不必要的分页符？