Templates with nested pages should drop history of all pages

Hi!

Currently, only the history of the specific template page is dropped, but not of nested child pages.

Example:

• Page A has many edits and a long page history.
• Page B is nested under page A and has also a long history.
• In my template provider, I define page A as the template page.
• When using the template provider, as result we get a copy of page A with copy of page B nested under it.

But only the new page of A has a clean history. The new page of B has it's original history, which is not useful.