Make scale methods in Frame generic over f32 and Vector

widget/src/qr_code.rs

@@ -86,7 +86,7 @@ impl<'a, Message, Theme> Widget<Message, Renderer<Theme>> for QRCode<'a> {
         let geometry =
             self.state.cache.draw(renderer, bounds.size(), |frame| {
                 // Scale units to cell size
-                frame.scale(f32::from(self.cell_size));
+                frame.scale(self.cell_size);
 
                 // Draw background
                 frame.fill_rectangle(