%\usepackage{chickenize}
%\colorstretch

% Show the last row of paragraphs in red when \looseness=-1 would work
\newcommand{\ShowLoosenessHelp}{
\usepackage{luatexbase}
\directlua{dofile("widow-assist.lua")}
}

% Show grid lines in red, for grid typesetting checks
\newcommand{\ShowGrid}{
\usepackage{atbegshi,picture,xcolor}
\AtBeginShipout{%
  \AtBeginShipoutUpperLeft{%
    \color{red}%
    \put(\dimexpr 1in+\oddsidemargin,
         -\dimexpr 1in+\topmargin+\headheight+\headsep+\topskip)%
      {%
       \vtop to\dimexpr\vsize+\baselineskip{
         \hrule
         \leaders\vbox to\baselineskip{\hrule width\hsize\vfill}\vfill
       }%
      }%
  }%
}
}