Please describe the problem:
GailRange exposes an "activate" action which calls gtk_widget_activate.  gtk_widget_activate only does something if the widget has defined an action (ie, set activate_signal in the class).  I'm not sure why this action was added to gail, but gail_range_get_n_actions() for instance could check that the widget class's activate_signal is non-zero before reporting an action.

Steps to reproduce:
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Open an application with a scroll bar (gedit will show one if there are enough lines of text).  Look at the scroll bar in accerciser.

Actual results:
Running queryAction().nActions will return 1, and queryAction.doAction(0) will not do anything.

Expected results:
Either AtkAction would be unimplemented, or nActions would return 0

Does this happen every time?
yes, although it is possible for a custom class to derive from GtkRange and have an action, in which case it makes sense for gail to expose it.

Other information: