Re-selecting icon in IconView

[Jeffrey Barish <jeff_barish earthlink net>]

Here's another annoying quirk:

In a TreeView, if I click a row that is already selected, nothing happens.  
I don't expect to get the changed signal from the corresponding 
TreeSelection because the row is already selected so the selection did not 
change.  This behavior is good.

In an IconView, if I click an icon that is already selected, I get 
selection-changed even though the selection did not change.  This behavior 
is bad.

Why these two views behave differently is a mystery to me.
-- 
Jeffrey Barish