fix: layout fixes for nav bar

src/app/mod.rs

@@ -449,7 +449,10 @@ where
             nav = nav.max_width(300);
         }
 
-        Some(Element::from(nav))
+        Some(Element::from(
+            // XXX both must be shrink to avoid flex layout from ignoring it
+            nav.width(iced::Length::Shrink).height(iced::Length::Shrink),
+        ))
     }
 
     /// Allows COSMIC to integrate with your application's [`nav_bar::Model`].

src/widget/nav_bar.rs

@@ -35,6 +35,7 @@ where
         .spacing(8)
         .style(crate::theme::SegmentedButton::ViewSwitcher)
         .apply(scrollable)
+        .height(Length::Fill)
         .apply(container)
         .height(Length::Fill)
         .padding(11)

src/widget/segmented_button/vertical.rs

@@ -87,11 +87,11 @@ where
         if num != 0 {
             height = (num as f32 * height) + (num as f32 * spacing) - spacing;
         }
-
-        let size =
-            limits
-                .height(Length::Fixed(height))
-                .resolve(width, height, Size::new(width, height));
+        let size = limits.height(Length::Fixed(height)).resolve(
+            self.width,
+            self.height,
+            Size::new(width, height),
+        );
 
         layout::Node::new(size)
     }