Wrong attachments displayed when opening 2 pages

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Open 2 wiki pages at the same time, one containing attachments and one 
containing no attachments (or simply containing different attachments)

What is the expected output? What do you see instead?

Both pages will show the same set of attachments instead of the correct 
attachments for each page.

In other words, let's say page A has 0 attachments and page B has 2 
attachments.  If I open both pages at the same time (opening tabs in the 
browser), either 0 attachments will be shown on both pages or 2 attachments 
will be shown on both pages (depending on which page I load last), instead of 
the correct attachments.

What version of the product are you using? On what operating system?

  PageAttachment version  : 3.1.0
  MediaWiki version       : 1.19
  PHP version             : 5.3.3
  Database name           : MySQL
  Database version        : 5.1.66
  Operating System name   : Debian GNU/Linux
  Operating System version: 6.0.7

Original issue reported on code.google.com by [email protected] on 11 Apr 2013 at 11:06