Last modified: 2007-03-20 11:54:56 UTC
I noticed this bug only once, and on Farsi (Persian) Wikipedia. I'm afraid it is not reproducible, but it is critical. In order for you to see the pages linked here correctly, you may need to install/activate your OSs support for Right To Left languages (including Persian). Please check the following link: http://fa.wikipedia.org/w/index.php?title=%D9%88%DB%8C%DA%A9%DB%8C%E2%80%8C%D9%BE%D8%AF%DB%8C%D8%A7:%D8%AA%D8%A7%D8%A8%D9%84%D9%88%DB%8C_%D8%A7%D8%B9%D9%84%D8%A7%D9%86%D8%A7%D8%AA_%D9%85%D8%AF%DB%8C%D8%B1%D8%A7%D9%86/%D9%85%D8%A7%D8%B1%D8%B3_%DB%B2%DB%B0%DB%B0%DB%B7&diff=prev&oldid=458725 As you can see, a change made by a user on the talk page, is shown on the DIFF correctly. Interestingly, if you look at the pages content here: http://fa.wikipedia.org/w/index.php?title=%D9%88%DB%8C%DA%A9%DB%8C%E2%80%8C%D9%BE%D8%AF%DB%8C%D8%A7:%D8%AA%D8%A7%D8%A8%D9%84%D9%88%DB%8C_%D8%A7%D8%B9%D9%84%D8%A7%D9%86%D8%A7%D8%AA_%D9%85%D8%AF%DB%8C%D8%B1%D8%A7%D9%86/%D9%85%D8%A7%D8%B1%D8%B3_%DB%B2%DB%B0%DB%B0%DB%B7&diff=prev&oldid=458725#.D8.AF.D8.B1.D8.AE.D9.88.D8.A7.D8.B3.D8.AA_.D8.AD.D9.81.D8.A7.D8.B8.D8.AA you will notice that the change which was shown on DIFF is not actually visible in the page output (it is not in the HTML if you view the source as well.) This means MediaWiki is not rendering that change for some reason. Now the things go more complicated; look at this page, which is the "next difference" of that same page on Farsi Wikipedia: http://fa.wikipedia.org/w/index.php?title=%D9%88%DB%8C%DA%A9%DB%8C%E2%80%8C%D9%BE%D8%AF%DB%8C%D8%A7:%D8%AA%D8%A7%D8%A8%D9%84%D9%88%DB%8C_%D8%A7%D8%B9%D9%84%D8%A7%D9%86%D8%A7%D8%AA_%D9%85%D8%AF%DB%8C%D8%B1%D8%A7%D9%86/%D9%85%D8%A7%D8%B1%D8%B3_%DB%B2%DB%B0%DB%B0%DB%B7&diff=next&oldid=458725 As you see, a second user has added some other text to the same section of the page. Normally, we would expect the system to show that the text added by the previous user is gone (with a yellow background on the right side) and the additions to be shown on the left with a green background. In this case, you notice that MediaWiki doesn't even concern about the portions of the text which are -- virtually -- replaced. I'm this second user. When editing that page, the text added by the first user was not even shown in the edit box. This makes me worry if the database is being written and read correctly. Fortunately, I've noticed this bug only once among the many diffs I usually check every day on different Wikipedia pages (English and Persian), but if the system is going to continue this way, it is prone to lossing many of the edits made.
