tex-region ignores value of tex-main-file

[Joe Wells]

The code of tex-region ignores the value of tex-main-file.

To reproduce the problem, first create the following files with these
contents:

----begin: test-driver.tex----
\documentclass{article}
\begin{document}
\input{test-section1}
\input{test-section2}
\end{document}
----end: test-driver.tex----

----begin: test-section1.tex----
\section{First Topic}
This is the first section.
% Local variables:
% tex-main-file: "test-driver"
% end:
----end: test-section1.tex----

----begin: test-section2.tex----
\section{Second Topic}
This is the second section.
% Local variables:
% tex-main-file: "test-driver"
% end:
----end: test-section2.tex----

Then, kill all buffers.  Then, visit test-section1.tex.  Then, mark a
brace-balanced region in test-section1.tex; for example mark the
sentence in this file.  Then, type “C-c C-r” to invoke tex-region.

The correct behavior would be to run LaTeX on a temporary file that
takes the header from test-driver.tex and the body from the current
buffer.  The actual (undesired) behavior is that no header is supplied
(because none is found in the current buffer) and you see an error
message like this from LaTeX:

  ./_TZ_30945-localhost-localdomain.tex:1: LaTeX Error: Missing 
\begin{document}.

The fix is to wrap the portion of tex-region that inserts the header
in the temporary file in something like this:

  (with-current-buffer (find-file-noselect tex-main-file) ...)

I hope this report is helpful.

Joe

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