Last modified: 2010-07-17 16:07:40 UTC
I found this issue in chinese wikipedia, while adding a link to a section whose title contains full-width space (" "). The result encoding of full-width space should be ".E3.80.80" , but now it is a underline ("_"). btw, why do you replace % by . ? it makes the url confusing.
*** This bug has been marked as a duplicate of bug 18431 ***