Now I'm lost...

You can even create backgrounds that are (almost) impossible to detect. If
you create a top level group called "Hidden background" and then "remove" it
from the card - it will appear in the backgroundids / backgroundnames of the
stack even though it is not visible on any cards.

However if you then:

set the backgroundbehavior of bg "Hidden background" to false

it will not only not be visible, it won't show up in the 'backgroundids /
backgroundnames of the stack".

Looping through each background number by using "the number of backgrounds
of stack" gives a completely different result, which at the moment is making
no sense... for instance I have go a test stack with two shared groups -
both of which I've turned off the backgroundbehavior (so the backgroundnames
is empty) - no bg 1 of stack is the first group, but bg 2 of stack is an
inner group and not the second shared group.... maybe it will make sense in
the morning....
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