When copy `n paste inserting additional text into an existing content with a rich text field, the integrated links are preceded by an "http". This will cause an error when publishing.
Steps to reproduction:
-create new content e.g. article
- in the rich text field create a content with internal link to a node and a link with mail address (mailto).
- Publish content
- Edit content and insert a new paragraph with text by copy 'n paste
=> before the links above a http was inserted which leads to a validation error when saving.