Subject: 11.89.1; Preview appears at the wrong position in the document

From: [email-masked]
Date: Mon, 01 Feb 2016 19:32:56 +0100

With a document like the following, that contains a custom enumeration,
the preview generated by preview-latex for the math that is within the
[...] of the items, appears at the wrong position: After hitting C-c C-p
C-b, the document looks as follows

  \pcase[$\langtext{inc}$] h<begin embedded image>inc<end embedded
  image>ello

whereas of course I would expect

  \pcase[<begin embedded image>inc<end embedded image>] hello

Kind regards,
Ralf

\documentclass[english]{article}

\RequirePackage{enumitem}
\newlist{pcases}{enumerate}{2} % this is the max. nesting level
\setlist[pcases]{
  label=\textbf{Case~\arabic*:}\protect\thiscase.~,
  ref=\arabic*,
  align=left,
  leftmargin=1.5em,
  itemindent=-1em,
  topsep=0.33em,
  labelsep=0pt,
  labelwidth=0pt,
  parsep=0pt
}
\newcommand{\pcase}[1][]{%
  \if\relax\detokenize{#1}\relax
    \def\thiscase{}%
  \else
    \def\thiscase{~#1}%
  \fi
  \item
}
\let\langtext\textsf

\begin{document}
    \begin{pcases}
    \pcase[$\langtext{inc}$] hello
    \pcase[$\langtext{get}$] world
  \end{pcases}

\end{document}

Emacs  : GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.6)
 of 2016-01-22 on binet, modified by Debian
Package: 11.89.1

current state:
==============
(setq
 AUCTeX-date "2016-01-31"
 window-system 'x
 LaTeX-version "2e"
 TeX-style-path '("~/.emacs.d/auctex" "/home/r/.emacs.d/elpa/auctex-11.89.1/style" "/home/r/.emacs.d/auctex/auto"
                  "/home/r/.emacs.d/auctex/style" "auto" "style")
 TeX-auto-save t
 TeX-parse-self t
 TeX-master t
 TeX-command-list '(("TeX" "%(PDF)%(tex) %(file-line-error) %(extraopts) %`%S%(PDFout)%(mode)%' %t" TeX-run-TeX
                     nil (plain-tex-mode ams-tex-mode texinfo-mode) :help "Run plain TeX")
                    ("LaTeX" "%`%l%(mode)%' %t" TeX-run-TeX nil (latex-mode doctex-mode) :help "Run LaTeX")
                    ("Makeinfo" "makeinfo %(extraopts) %t" TeX-run-compile nil (texinfo-mode) :help
                     "Run Makeinfo with Info output")
                    ("Makeinfo HTML" "makeinfo %(extraopts) --html %t" TeX-run-compile nil (texinfo-mode) :help
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                    ("AmSTeX" "amstex %(PDFout) %(extraopts) %`%S%(mode)%' %t" TeX-run-TeX nil (ams-tex-mode)
                     :help "Run AMSTeX")
                    ("ConTeXt" "%(cntxcom) --once --texutil %(extraopts) %(execopts)%t" TeX-run-TeX nil
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                    ("BibTeX" "bibtex %s" TeX-run-BibTeX nil t :help "Run BibTeX")
                    ("Biber" "biber %s" TeX-run-Biber nil t :help "Run Biber")
                    ("View" "%V" TeX-run-discard-or-function t t :help "Run Viewer")
                    ("Print" "%p" TeX-run-command t t :help "Print the file")
                    ("Queue" "%q" TeX-run-background nil t :help "View the printer queue" :visible
                     TeX-queue-command)
                    ("File" "%(o?)dvips %d -o %f " TeX-run-dvips t t :help "Generate PostScript file")
                    ("Dvips" "%(o?)dvips %d -o %f " TeX-run-dvips nil t :help "Convert DVI file to PostScript")
                    ("Ps2pdf" "ps2pdf %f" TeX-run-ps2pdf nil t :help "Convert PostScript file to PDF")
                    ("Index" "makeindex %s" TeX-run-index nil t :help "Run makeindex to create index file")
                    ("Xindy" "texindy %s" TeX-run-command nil t :help "Run xindy to create index file")
                    ("Check" "lacheck %s" TeX-run-compile nil (latex-mode) :help
                     "Check LaTeX file for correctness")
                    ("ChkTeX" "chktex -v6 %s" TeX-run-compile nil (latex-mode) :help
                     "Check LaTeX file for common mistakes")
                    ("Spell" "(TeX-ispell-document \"\")" TeX-run-function nil t :help "Spell-check the document")
                    ("Clean" "TeX-clean" TeX-run-function nil t :help "Delete generated intermediate files")
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                    ("Other" "" TeX-run-command t t :help "Run an arbitrary command"))
 )