TYPO3 Core

We can't apply a max-height rule for every tt_content element (lost information, not suitable for every element).
What we can do is a max-height rule while dragging the element.

Workaround for limiting the current element:

typo3_src/Build/Resources/Public/Less/TYPO3/_module_web_page.less :

.t3-page-ce-dropzone-available.active, .ui-sortable-helper, .t3-page-ce-dropzone-possible{
max-height:200px!important;
}
.ui-sortable-helper{
overflow:hidden;
}

TODO:
typo3/sysext/backend/Resources/Public/JavaScript/LayoutModule/DragDrop.js
adding a class for the container while dragging
max-height rule for all tt_content elements in this container

Optional:
Header into the .t3-page-ce-header
Hide .t3-page-ce-body during dragging

Hide .t3-page-ce-body while dragging seems a nice idea: +1

Patch set 2 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at http://review.typo3.org/41690