Building a SPA requires that each group (page) must be shown/hidden. Because some groups will be taller than others, we need to collapse the height to fit each groups height which is easily done in the old engine, simply add a group underneath the content which is hidden and collapsed.
Am I correct in thinking that the new engine can not collapse in this way? For example, make you index page 1000 high and add a hidden and collapsed group 500 high, on preview you should see the index page as 500px high but it seems to remain at 1000 high with the new engine.
How can we create a SPA with the height shrinking to fit content in the new engine?