Hi Simon Clement:
Thanks for submitting your post.
The copy and paste confirmation message/footer behavior you are experiencing is expected behavior in FileMaker 12.
The ability to copy an object in FileMaker 11 and paste it into a FileMaker 12 footer without receiving the message, however, is a bit odd. I was able to reproduce that issue and have forwarded this thread along with my findings to our Development and Testing department.
Just to confirm:
I have a form layout with multiple parts
Each part's vertical height is less than the height of the FileMaker Pro object I've drawn, copied and am now about to paste.
But the combined height of all parts is greater than the height of the object.
If I click on the part's tab so that is highlighted and paste the object then there is no problem pasting the object. It simply overlaps other parts.
Unless the highlighted part is the footer in which case the message is displayed and the body height is adjusted. (Even though the body height is greater than that of the object's the body height is still increased).
This is not critical by any means but I've noticed a few other anomalies around this issue which I'm trying to reproduce and I suspect that this has something to do with it.