unworkable selection model for treeview

[Paul Davis <paul linuxaudiosystems com>]

AFAICT, the treeview widget will change its selection at button press,
with no delay to allow for a drag operation.

i cannot see how to combine this model with the desire to select
multiple items (in one or several steps), then click on one of the
selected items to drag the entire set of selected items. at present,
this operation will collapse the selection down to the clicked-upon item
before the drag begins.

there is GTK software which works around this, but they appear to do it
by completely dropping the selection model of the treeview.

is this really the desired state of affairs?

--p