Implement MulAssign for Pos2

crates/emath/src/pos2.rs

@@ -1,5 +1,7 @@
-use std::fmt;
-use std::ops::{Add, AddAssign, Sub, SubAssign};
+use std::{
+    fmt,
+    ops::{Add, AddAssign, MulAssign, Sub, SubAssign},
+};
 
 use crate::{lerp, Div, Mul, Vec2};
 
@@ -305,6 +307,14 @@ impl Mul<Pos2> for f32 {
     }
 }
 
+impl MulAssign<f32> for Pos2 {
+    #[inline(always)]
+    fn mul_assign(&mut self, rhs: f32) {
+        self.x *= rhs;
+        self.y *= rhs;
+    }
+}
+
 impl Div<f32> for Pos2 {
     type Output = Self;
 

crates/epaint/src/shapes/shape.rs

@@ -484,7 +484,7 @@ impl Shape {
                     let row = Arc::make_mut(&mut placed_row.row);
                     row.visuals.mesh_bounds = transform.scaling * row.visuals.mesh_bounds;
                     for v in &mut row.visuals.mesh.vertices {
-                        v.pos = Pos2::new(transform.scaling * v.pos.x, transform.scaling * v.pos.y);
+                        v.pos *= transform.scaling;
                     }
                 }