Hi,
I'm using the Web Asset Manager to replace the old "addScript" method. The problem is that the WA does not render the file url correctly in call cases.

Tested with the function:
$wa = \Joomla\CMS\Factory::getApplication()->getDocument()->getWebAssetManager();
$wa->registerAndUseScript($name, $url ...)

Problem 1 : it adds a wrong slash at the beginning

Standard test

Url used : /media/com_test/assets/script.js
Expected result (working with addScript) : <script src="/media/com_test/assets/script.js ...
Real result : <script src="//media/com_test/assets/script.js ...

there is an additional slash at the start of the file

Additional test :

If I use a variable in the url, then it works
Url used : /media/com_test/assets/script.js?rev=123
Real result : <script src="/media/com_test/assets/script.js?ver=123 ...

there is no additional slash

Problem 2 (the most important) : it adds the root at the beginning

This problem occours when you are working in a subfolder and using the multilanguage
Page url : http://localhost/joomlatest/index.php/fr/
Url used : /joomlatest/media/com_test/assets/script.js
Expected result (working with addScript) : <script src="/joomlatest/media/com_test/assets/script.js ...
Real result : <script src="/joomlatest/joomlatest/media/com_test/assets/script.js ...

the root is duplicated

why does the WA add some data to the url passed ? this must not be done. The url must be given by the variable passed to the function, and it must not be altered