carousel: display one page at a time

src/widgets/pages/image.rs

@@ -44,6 +44,7 @@ impl ImagePageWidget {
     }
 
     fn init(&self) {
+        self.widget.set_property_expand(true);
         self.widget.set_halign(gtk::Align::Fill);
         self.widget.set_valign(gtk::Align::Fill);
 

src/widgets/pages/welcome.rs

@@ -4,13 +4,14 @@ use libhandy::prelude::HeaderBarExt;
 
 pub struct WelcomePageWidget {
     pub widget: gtk::Box,
+    handle: libhandy::WindowHandle,
 }
 
 impl WelcomePageWidget {
     pub fn new() -> Self {
         let widget = gtk::Box::new(gtk::Orientation::Vertical, 0);
-
-        let welcome_page = Self { widget };
+        let handle = libhandy::WindowHandle::new();
+        let welcome_page = Self { widget, handle };
 
         welcome_page.init();
         welcome_page
@@ -71,7 +72,9 @@ impl WelcomePageWidget {
         headerbar.set_show_close_button(true);
         headerbar.set_title(Some(&gettext("Welcome Tour")));
 
-        self.widget.add(&headerbar);
+        self.handle.add(&headerbar);
+
+        self.widget.add(&self.handle);
         self.widget.add(&container);
     }
 }