Shifted frame with showframe package

[jspitz]

(Moving from reutenauer/polyglossia#33)

When compiling this example:

% !TeX TS-program = xelatex
\documentclass{book}
\usepackage{xcolor}

\usepackage{polyglossia}
\setdefaultlanguage{arabic}
\newfontfamily\arabicfont[Script=Arabic]{Amiri}

\usepackage{showframe}
\begin{document}
A\newpage B\newpage C
\end{document}

it becomes obvious that showframe does not recognize text area and margins correctly when
\setdefaultlanguage{arabic} is used.

This problem is not restricted to the showframe package but to packages using the information about the page layout in general, of course, for example the thumbs package.

[u-fischer]

bidi is (depending on the loading order of the various packages) trying to patch eso-pic, which imho the wrong place. It would make more sense to switch back to LTR before the atbegshi picture.

\documentclass[a4paper]{book}%
\usepackage{atbegshi}
\usepackage{etoolbox}
\usepackage{xcolor,graphicx}
%
\makeatletter
\patchcmd\AtBegShi@BeginPicture{\begingroup}{\begingroup\@RTLfalse}{}{\fail}
\makeatother
\usepackage{polyglossia}
\setdefaultlanguage{arabic}
\newfontfamily\arabicfont[Script=Arabic]{Amiri}
%load later to avoid the eso-pic patch:
\usepackage{showframe}
\usepackage{wallpaper}

\begin{document}
\ThisCenterWallPaper{1}{example-image-duck}
A\newpage B\newpage C
\end{document}