rename a bit

src/core/image.rs

@@ -10,7 +10,7 @@ impl Widget for Image {
         painter.draw_texture(&self.handle);
     }
 
-    fn size(&mut self, _: &mut SizeCtx) -> Vec2 {
+    fn get_size(&mut self, _: &mut SizeCtx) -> Vec2 {
         self.handle.size()
     }
 }