Redirects incorrectly handled with subfolders.

[zauberparacelsus]

There appears to be a problem with how the flask-debugtoolbar follows redirects, when the redirect goes into a subdirectory. For example, with the flask system I wrote to run the site for my webcomic:

I click the link http://localhost:5000/content/main/latest and it takes me to the redirect debug page as expected. Clicking the link to follow the redirect's destination should be http://localhost:5000/content/main/51 but it instead takes me to http://localhost:5000/content/main/content/main/52

I'll repeat those links one after another with the domain and port number chopped off, to better illustrate the difference:

Right Link: /content/main/51
Wrong Link: /content/main/content/main/51

With the wrong link, the /content/main subdirectory path is doubled, which in turn leads to a 404.