title: GTK prevent tab from focusing non-visible widget
body: <p>I have several GtkExpanders along side some labels all inside of a GtkFlowBox. When tab is pressed focus cycles through the contents of the flow box. When focus reaches an expander then tab starts focusing the widgets inside the expander. The problem is this behavior occurs even if the expander is closed. Ideally if the expander is closed focus should shift to the next item in the flow box rather than the children of the expander but I'm not sure how to accomplish this. I suppose a more generic question is how do I prevent GTK from focusing something that is not visible?</p>