clicked/toggled signal for GtkComboBox

[Holger Berndt <berndth gmx de>]

Is it possible to get a notification when the user clicked on a
GtkComboBox? That is, before the user actually makes a selection (and
thus the "changed" signal is emitted).

It seems to be possible to connect to the "focus-in-event", but that
doesn't work when the combo box doesn't focus
(gtk_combo_box_set_focus_on_click() set to FALSE).

Browsing through gtk's code, it seems that what I am requesting is for
the combo_box->priv->button's "clicked" or "toggled" signal to be
exposed, which doesn't seem to be done currently.

Am I missing something?

Holger