GtkComboBox signals

[Pekka Riikonen <priikone iki fi>]

I'm trying to work out a seemingly trivial use case with combo box with an 
entry.  I want to receive signal only in two cases:

 1. When user types something into the entry and then presses Enter key.
 2. When user selects something from the combo box with a mouse.

The first one is simple, it's the "activate" signal on the entry but the 
second one with "changed" signal on the combobox isn't because the signal 
is emitted also when typing into the entry.  It effectively becomes 
impossible to determine whether item was typed in or selected from the 
list.  And if user typed it in I only want the signal when Enter key was 
pressed.  But if user clicked on the item with a mouse I want the signal.

If only combobox would emit the "activate" signal for the entry when item 
is selected from the list.

Any way to get this working?

        Pekka