Symfony version(s) affected: 4.4.16

Description

Setting the framework.ide configuration via xdebug.file_link_format (recommended on https://symfony.com/doc/current/reference/configuration/framework.html#ide) adds a redundant slash at the beginning of the file path. This prevents e.g. PhpStorm zu open the particular file.

How to reproduce

1. Set this configuration in php.ini file:

xdebug.file_link_format="phpstorm://open?url=file:%f&line=%l"

2. Klick e.g. on the link to the Controller class in Symfony's toolbar.