Hello,
There is an issue with TListView + Multiselect and dmAutomatic DragMode on MS Windows.
01 - Download the attached project. compile and run.
02 - Perform a single click on the white space below the items. then move your mouse. (DON'T click and drag. just a single left click. release the button. and move your cursor).
03 - And you will see it starts to drag, but dragging nothing. which is not cool.
This behavior is not available on GTK2 linux (tested inside xfce and Cinnamon). (which I thing is because of this:
http://forum.lazarus-ide.org/index.php?topic=18048.0)
(Lazarus Trunk, FPC Trunk, Windows 7)
PS: Drag n Drop Arranging is a very user friendly operation. Please, don't disappoint me.