Problem: The drop popup that follow the mouse is wrongly located if the drop zone is scrolled : the offset is on the total document, and not on the visible part of the document. If scrolled too much, drag and drop becomes impossible.

Steps to reproduce :

• Search and open a content that accept drag and drop
• Show side to side the search and the content (as in screenshot)
• Scroll down the view of that content
• Drag and drop from the search to the content.
• If scrolled by more than "content height" offset, the drop becomes impossible and popup is outside the window (see 2nd screenshot)