return url doesn't get properly decoded after login

Question

When accessing SO with a bookmark that has a list of tags separated by or, for instance:

http://stackoverflow.com/questions/tagged/html%20or%20javascript?tab=newest&pagesize=50

When logging in from this URL, the browser ends up redirected to http://stackoverflow.com/users/login?returnurl=%2fquestions%2ftagged%2fhtml+or+javascript#log-in

After logging in, the URL the browser gets redirected to is http://stackoverflow.com/questions/tagged/htmlorjavascript, which obviously isn't a very popular tag.

This is Firefox 13.0.1, by the way.

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UPDATE

Further testing reveals that whitespace or %20 get encoded to + when pressing the login button, and that + gets ignored when decoding the url to redirect to after the login.

But, if the initial URL contains + instead of whitespace or %20, the url when logging in contains the tags separated by %2b. They get decoded correctly to + when redirecting after the login so it works properly if the tags in the URL are separated by +.

Such a pity Firefox decodes + and %2B to whitespace when used in a bookmark.

Answer 1

This was an issue of overly aggressive URL sanitization. Fixed in the next build.