If you add an external link on a bold, italic or underlined element , you will not be able to close the windows with the dedicated closing button. Clicking outside closes the window though.

Steps to reproduce:

Install Ibexa 3.3.6

Create a new article and inside a rich text field(intro or body), add: This is text message.

Select the message and apply a bold or italic or underline on it. You will get for instance: This is a text message

Select the whole sentence and click on link button in order to apply a link on it.

The link is well applied but you can not close the window.

But, if you select a part of the text such as text message and do the same, it works fine 

Expected result:

Being able to close the window using the dedicated button