[AUCTeX] Backward search with Evince when compiling only part of the document

[Qiang Yin]

Hi,

I have a large file to compile so I split into several files and use
AUCTeX's "command on buffer" function.

It works well. I can press 'C-c C-b' to just compile the file I am
currently editing. Forward Search works well too. The only part that
dose not do the desired job is backward search. Every time I double
click on the pdf file it jumps to a "_region_.tex" buffer, but not the
buffer I am currently editing.

I google it and find a very old thread related to this topic

  http://article.gmane.org/gmane.emacs.auctex.general/4285

I have tried  the code mentioned in the thread. But it dose not do the
trick, since it is a 4 year old thread. Also I find an item in the news
of AUCTeX 11.89 says:

  Forward and backward search with Evince now also work when only a
  region of the document is compiled/viewed.

https://www.gnu.org/software/auctex/manual/auctex/Changes.html

So is that possible to make backward search to work as I want? What's
the additional setup?

Cheers,
Qiang

------------------------more info-----------------------------------------
Emacs version: GNU Emacs 24.5.1
AUCTeX version: 11.89.1
Evince version: 3.20.0
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