Wikimedia Bugzilla is closed!

Created attachment 12810 [details]
Screenshot of ripped-apart link inspector

I can consistently reproduce the following:

* Select an unlinked word
* Create the insert link button (with intention to turn the word into a link)
* If you hit Return immediately after (before it has finished opening) it will replace the focussed node with a new line. Though that is a separate bug and arguably an invalid use case (why would one be pressing Return at this point, the user hasn't even seen the options yet. It interpreting it as intend to replace the node isn't entirely unreasable, but that's a separate bug - bug 51075).
* At this point the link inspector dom has blown up. Part of it is gone, and the other part is left half-way across the screen at a seemingly arbitrary offset (see attachment).