Steps to reproduce:
- Add a new section to a talk page, e.g., https://en.wikipedia.org/wiki/User_talk:Whatamidoing_(WMF)?veaction=editsource§ion=new
- Add a section title and some content
- Click the Save button
- See the default edit summary of /* Subject */ new section pre-filled (very nice)
- Realize that it's grayed out and you can't change it.
Ideal behavior: Having the very nice default edit summary, but being able to change it, too.