Sets the :visible property of the action to @visible. Note that this doesn’t necessarily mean effective visibility. See gtk_action_is_visible() for that.
%TRUE to make the action visible
Deprecated: Use #GAction instead, and control and monitor the state of #GtkActionable widgets directly
2.6
See Implementation
Sets the :visible property of the action to @visible. Note that this doesn’t necessarily mean effective visibility. See gtk_action_is_visible() for that.