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Thank you so much jayjay! We are so lucky to have you build the new version! It solves one of the biggest problem of using dokuwiki on XOOPS for asian users. For example, Chinese characters now can be searched correctly with double quotes "".
I have two issues of upgrading the dokuwiki from an older version to the new version directly with old data. They are not dokuwiki's fault. Just in case some other people encounter the issues, here's how to solve them:
1. For big wiki pages (e.g. > 100K in one page), the newly included "linebreak" plugin slows the performance significantly. If your computer is slow, it takes 30~60 seconds to load a page larger than 100K, consuming 100% of CPU during the period. Therefore, if you suddenly encounter significant performance issue, just uninstall the plugin and you'll be fine. (I suspect the xbr plugin might have better performance as a replacement but I haven't tried.)
2. The new version of dokuwiki correctly identifies separators in Chinese and replaces them with SEPCHAR (e.g. '_'). However, the old version didn't. As a result, based on the old data, all wiki entries with a separator in the title are now missing when read by the new dokuwiki. You can just write a program to rename those files and things will work again.
Good luck!