GtkIconView and item-activate signal

[nf2 <nf2 scheinwelt at>]

i'm using GtkIconView in single selection mode, and the "item-activate" 
signal isn't always fired on mouse double clicks.
especially when i move the selection around with single clicks and than 
double click on another item, nothing happens (it just moves the 
selection, but doesn't fire "item-activate").

is this a known problem (i'm using Gtk 2.10)? i looked at the 
bug-reports and changelogs, but couldn't find anything.

regards,
norbert