For the link to be added, but to still have the editor focused on the text I'm currently editing.
The editor jumped to the top of the post, and I had to scroll down to get back to the anchor text where I'd added the link.
Confirmed in latest versions of Firefox and Chrome on Mac OS X.

Reported in the public forums in 871246-f
Another report via Twitter
This user reports the same thing happening when adding images, and I was able to confirm that as well.
Another report on Twitter.
Issue affecting Chrome and Edge.
Another report in the forums: http://en.forums.wordpress.com/topic/problem-editing-links
User is on Windows 7, and has tried Firefox 54 and Chrome.
Reported in 614267-ZD
Adding Images Screencast: https://cloudup.com/cPntWQzFD_g
Closing in favour of #16873
@dcoleonline don't know if you saw but this has been fixed in the other issue, in case you want to follow up with your user.
I'll follow up on the forum thread.
Most helpful comment
Closing in favour of #16873