I just posted on this, not seeing the present post. This is definitely a hidden feature, not something that i’d ever have found without being told where to look. I’m wondering what was wrong with where it is in pre-GB WordPress?
Also, for the developers, if you invoke this feature when there’s a message bar at the top of the page that bar partially covers the permalink and completely covers the edit button (desktop, about 1200 px wide).
Also, when i first clicked on the edit (permalink) button, the whole thing disappeared and i had to click the title again. Ah… now i see that it seems to be intended to be hidden as soon as you focus anywhere else, although i didn’t think that i had done that.
And finally – this is quite problematic – when i finally get the permalink to edit it is URL encoded, so i cannot actually edit it but instead have to type or paste in the whole permalink (it may work passably with Roman characters but not in other alphabets like Cyrillic, Chinese, etc.)