Steps to reproduce:
- Open a random page
- Edit source
- Add &ooui=1 to the url
- Click show preview
Current behavior:
OOUI design is switched back to old one after showing preview
Expected behavior:
User (or probably better gadget dev) sometimes need to know if some gadget will work after previewing a page
Note: Feel free to close this as not planned, because OOUI will be deployed soon and the &ooui=1 functionality will be removed after that.