In Wiki Markup mode, if we select a text with the mouse and click on the Link Icon, and select a link, then the link is created, but the linktext is missing.
In the Rich Text mode, the same action works.

This is super annoying since we have many users that only work with the Wiki Markup mode.

Here is a movie showing the problem:
http://screencast.com/t/ajWvFNSl

This bug was introduced in 2.7.x.
Persists in version 2.8

Version 2.6.x are fine.
The difference is that a different link dialogue is used.