Track retained layout validity explicitly

src/widget/position/max_size.rs

@@ -9,17 +9,17 @@ pub struct MaxSize {
 impl Widget for MaxSize {
     fn draw(&mut self, painter: &mut Painter) -> Size {
         let child = painter.widget(&self.inner).size();
-        let output = painter.output_size();
+        let own = painter.px_size();
         Size {
-            x: capped(child.x, self.x, output.x),
-            y: capped(child.y, self.y, output.y),
+            x: capped(child.x, self.x, own.x),
+            y: capped(child.y, self.y, own.y),
         }
     }
 }
 
-fn capped(len: Len, max: Option<Len>, output: f32) -> Len {
+fn capped(len: Len, max: Option<Len>, own: f32) -> Len {
     match max {
-        Some(max) if len.apply_leftover().to_px(output) > max.apply_leftover().to_px(output) => max,
+        Some(max) if len.apply_leftover().to_px(own) > max.apply_leftover().to_px(own) => max,
         _ => len,
     }
 }