Creating a mailto link in ckeditor with subject and body params encode spaces as "+" instead of "%20"

Steps to reproduce:

1. In ckeditor click on the link button (or hit Ctrl+L)
2. In the second field of the pop-up select Mail Address
3. Click on Options to expand the last two fields and complete them with texts containing spaces and click OK
4. Save and view

Expected result:

A link that when you click on the mail client will open up with the Subject and Body pre-filled

Actual result:

Although the messages are pre-filled, instead of spaces the words are separated by the sigh "+"

This can be seen in wiki mode as well where the spaces should be encoded as "%20" instead of "+".

Additional information:

This is a result of a jquery bug that was fixed in a later version that XWiki uses.

issue can be seen here: https://github.com/jquery/jquery/issues/2658