Add a special character.
Steps to Reproduce:
- Open a page in VisualEditor. Don't click anywhere in it.
- Go to Insert > Special characters to open the Special charater inserter tool.
- Click on a character (or several).
Nothing is added, but the "Save" button lights up. You can't use it, though.
If you click elsewhere, the tool disappears, but nothing else happens. "Save" is still green, but you still can't use it.
If you go back into the special character tool and add a new special character, then all the original ones appear at the start of the page, but the tool's dialog box is still open.
If you then cancel (to get rid of the box), Bad Things happen, including snowmen and partial duplication of the page. You still can't save.