The hidden noIcon OOUI element has been given a dispaly: inline inline style, and is in front of the text input, obscuring the text for selection.
Steps to reproduce
- Open the editing interface for any page
- From the toolbar above the editing area, open the "insert link" dialog (the one with the "link" icon)
- Add some text in both fields
- With your mouse, try to select text in those fields
In particular, the observed behaviour was that you could not start the selection from the first letter or two. Selecting other text worked, but clicking on the first letter didn't clear the selection.