Collapse all nested elements on fold #2471
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What is this pull request for?
On a page with lots of nested elements multiple levels deep
the performance regresses very much especially with lots of
TinyMCE instances. Also UX is getting messy very soon.
In order to make the page faster and clean up the interface,
we now collapse all nested elements and their nested elements
if an element gets folded by the user. Next time the element
expands it will present all nested elements collapsed to the
user making a) the UX much faster and more cleaned up.
This also reverts #2470
because we need to render nested elements even if the element is folded,
because we need the element present in the DOM for the feature
"click element in the preview => load and expand element editor".
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