mistakes were fixed and sins were committed

src/core/position/pad.rs

@@ -10,14 +10,23 @@ impl Widget for Pad {
         painter.widget_within(&self.inner, self.padding.region());
     }
 
-    fn desired_size(&mut self, ctx: &mut SizeCtx) -> Size {
-        let mut size = ctx.size(&self.inner);
-        if size.x.rest == 0.0 {
-            size.x.abs += self.padding.left + self.padding.right;
-        }
-        if size.y.rest == 0.0 {
-            size.y.abs += self.padding.top + self.padding.bottom;
-        }
+    fn desired_width(&mut self, ctx: &mut SizeCtx) -> Len {
+        let width = self.padding.left + self.padding.right;
+        let height = self.padding.top + self.padding.bottom;
+        ctx.outer.abs.x -= width;
+        ctx.outer.abs.y -= height;
+        let mut size = ctx.width(&self.inner);
+        size.abs += width;
+        size
+    }
+
+    fn desired_height(&mut self, ctx: &mut SizeCtx) -> Len {
+        let width = self.padding.left + self.padding.right;
+        let height = self.padding.top + self.padding.bottom;
+        ctx.outer.abs.x -= width;
+        ctx.outer.abs.y -= height;
+        let mut size = ctx.height(&self.inner);
+        size.abs += height;
         size
     }
 }