Move pages behavior could be improved

Steps to replicate:

• user A creates a test page
• user B created a child page on the test page and restrict edit/view to himself
• user C moves test page to another space. The page is moved, but not the child page (as expected). However, it could be useful if a warning was shown stating that are child restricted pages that will not be moved.

This is specially helpful when you are moving pages to delete the space. In this case, the child restricted pages will be lost. The warning would allow the user that is moving the page to notify users with restrict pages to move them as well.