it works for me in the meantime
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You cannot limit the height of a repeater item, as this will require non trivial cropping of the text.
What you can do is make the item large such, if the distance between the bottom element in the repeater (the button) and the bottom of the repeater itself is over 70px, the content will expand till the border without moving the border. Only when getting to about 10px from the border, will the border move.