sized spans!

src/layout/painter.rs

@@ -151,11 +151,19 @@ impl<'a> Painter<'a> {
     }
 
     pub fn size<W>(&mut self, id: &WidgetId<W>) -> Vec2 {
-        self.widgets.get_dyn_dynamic(&id.id).size(SizeCtx {
+        self.widgets
+            .get_dyn_dynamic(&id.id)
+            .size(&mut self.size_ctx())
+    }
+
+    pub fn size_ctx(&mut self) -> SizeCtx {
+        SizeCtx {
+            screen_size: self.screen_size,
             size: self.region().in_size(self.screen_size),
             text: self.text,
             textures: self.textures,
-        })
+            widgets: self.widgets,
+        }
     }
 
     pub(crate) fn redraw(&mut self, id: &Id) {