#316 preview produce to much pages when pgf is loaded.

[U_Fischer]

The following document

   \documentclass{article}
   \usepackage{pgfcore}
   \usepackage[active]{preview}
   \begin{document}
   Text
   \begin{preview}HELLO\end{preview}
   \end{document}

produce 2 pages when compiled with pdflatex in a current texlive 2014. Page 2 contains the text "Text". With texlive 2012 there is no problem: One gets the expected one page document with the "HELLO".

(I suspect that this behaviour is at least in part also responsible for the problem of tikz with auto-pst-pdf: http://tex.stackexchange.com/questions/166623/tikz-and-auto-pst-pdf-break-ghostscript)

Ulrike Fischer

[Herbert Voss]

This also depends to the wrong patch of preview.

[Esseger]

As in the previous bug (315), this is due to the wrong patch of preview. The hack in pfgutil-latex.def, to make preview compatible with everyshi, is:

% Preview hack: preview.sty hacks into \shipout (which is ok), but
% does not honour everyshi.sty (which is not ok). This causes
% everyshi material to get lost.
\AtBeginDocument{
\@ifpackageloaded{preview}{%
% Ok, package loaded. Swap definitions of everyshi.sty's shipout
% and preview.sty's shipout:
\let\pgf@temp\pr@shipout% This is the original shipout
\let\pr@shipout\@EveryShipout@Shipout%
\let\@EveryShipout@Org@Shipout\pgf@temp%
}{}%
}

There are two problems with this patch:
- it does not work if preview is loaded but not active (see bug 315)
- it does not set \shipout correctly. Indeed, preview has to cancel the shipout of usual pages, so it sets \shipout to a fancy version of "do nothing". But everyshi sets again \shipout to something non-trivial, so usual pages are again output, giving rise to too many pages. So, the patch should again empty \shipout.

Here is a correct patch:

\AtBeginDocument{
\@ifpackageloaded{preview}{%
% Ok, package loaded. Swap definitions of everyshi.sty's shipout
% and preview.sty's shipout:
\ifPreview
\let\shipout\@EveryShipout@Org@Shipout%This is the null version of \shipout, created by preview and saved by everyshi
\let\@EveryShipout@Org@Shipout\pr@shipout% This is the original shipout
\let\pr@shipout\@EveryShipout@Shipout%
\fi
}{}%
}

[Kirill Müller]

Is there a workaround which I could apply as a user? Inserting the correct patch above (with \makeatletter and \makeatother) in a document did not work for me.

[Kirill Müller]

Save \shipout before \begin{document}, and restore it afterwards.

...
\let\myshipout=\shipout
\begin{document}
\let\shipout=\myshipout
...

Reference: http://tex.stackexchange.com/a/235750/8057

[Christian Feuersänger]

I have applied the suggested fix as mentioned in the recent comments. It appears to work as expected