BUG With listview draging with 2.3.2 (and previously)

[Petri Kanerva <petri kanerva surfeu fi>]

This bug was introduced in the 2.2 branch when there were UI fixes for
listview.

Now that dragging is done via the middle-button (mousewheel in my case)
when I have selected multiple files and try to drag them, only the file
that I click on is dragged. If I hold control down when starting to
drag, all other files are dragged, except the file I clicked on.

Reason: the middle-button is treated like LMB when clickin, so that it
changes selection before dragging. IMHO it should be only used to drag
and the selecting /unselecting done via LMB. Is this an oversight in the
code, or intended?

 Petri