looks like GTK_POLICY_EXTERNAL for a GtkScrolledWindow could be used to get this to work https://developer.gnome.org/gtk3/stable/GtkScrolledWindow.html#GtkPolicyType
looks like GTK_POLICY_EXTERNAL for a GtkScrolledWindow could be used to get this to work https:/ /developer. gnome.org/ gtk3/stable/ GtkScrolledWind ow.html# GtkPolicyType