TYPO3 Core

If running the old Backend, you are not able to select the modules from the WEB Category (WEB->Page for example).
If you click on "Page" it is producing a JavaScript error Message:

"top.rawurlencodeAndRemoveSiteUrl is not a function"

Solution:
I figured out, the function is missing in the old BE javascript code.
If I add the code to the alt_main.php file it is working again.

############

$this->mainJScode='
..... ##########

/**
    * Function to similar to PHPs  rawurlencode() which removes TYPO3_SITE_URL;
     */

function rawurlencodeAndRemoveSiteUrl(str)    {    //
        var siteUrl = "' . t3lib_div::getIndpEnv('TYPO3_SITE_URL') . '";
        return rawurlencode(str_replace(siteUrl, \'\', str));
    }
    .....

(issue imported from #M10445)