Drag & drop broken with originLeft: false or originTop: false

If the setting isOriginLeft is set to false, the display is correct but the drag and drop function doesn't work as it assumes the alignment is to the left. Can anyone offer a fix for that? Thanks, Gareth

Start by reproducing dragging with originLeft: false and originTop: false, then trace the drag-and-drop alignment logic that assumes left alignment. Done means items can be dragged correctly under both settings; the issue names no files or tests, so the relevant entry points must be located first.

Written by the indexing model from the issue text.