Automatically suggest new page titles if a page with the title already exists

Problem: When you create a page with a title that's the same of another page in the space, you get this error:

The user now has to switch back to the editor context and think of a new name.

To improve this experience a bit, we should automatically suggest a new page title based on the parent page. We just pre-fix the parent page and suggest that to the user:

(Old screenshot, UI needs to be updated, but you get the picture).

We could get smarter with the logic:

• Suggest the parent page pre-fixed
• Fit there is no parent page, or the parent page suggested name above already exists, it pre-fixes it with a space key
• If that fails it could pre-fix a date/timestamp?
• etc...

Whoever picks this up let me know.