TYPO3 Core

In a multidomain environment, an external links set via the RTE in one of the domains to another of the domains is rewritten to point to the same domain.

Steps to reproduce:

1. Create a multidomain environment with www.bla.com and www.blubb.com
2. Create a content element on a page in www.bla.com.
3. Create an external link to a page on the other domain www.blubb.com, e.g., http://www.blubb.com/en/test.html
4. Save content element
5. View the page with the content element. The link will point to http://www.bla.com/en/test.html

If you create the link as an internal link using the TYPO3 element browser, it works correctly. However, this is not an option because:

1. accessibility, external links should be marked as such
2. editors are restricted to editing the page tree of one domain only
(issue imported from #M11231)