Symfony version(s) affected: 3.4+

Description
After these changes https://github.com/symfony/symfony/pull/26758/files#diff-9b36be9db6ed4f3c306cb876b1f134c5R84 the base url is rendered twice:

first here:

later here:

Note the /index.php/index.php/ part:

How to reproduce
Clone the https://github.com/symfony/demo project and click over any file link in profiler or toolbar to open it into Web code viewer.

Possible Solution
I'm not sure, probably we should check the base url in $this->urlFormat before return it.