app work?

src/core/position/sized.rs

@@ -12,6 +12,13 @@ impl Widget for Sized {
     }
 
     fn desired_size(&mut self, ctx: &mut SizeCtx) -> Size {
+        let rel = ctx.size.rel;
+        if let Some(x) = self.x {
+            ctx.size.axis_mut(Axis::X).set(x.apply_rest(rel.x));
+        }
+        if let Some(y) = self.y {
+            ctx.size.axis_mut(Axis::Y).set(y.apply_rest(rel.y));
+        }
         Size {
             x: self.x.unwrap_or_else(|| ctx.size(&self.inner).x),
             y: self.y.unwrap_or_else(|| ctx.size(&self.inner).y),