I forgot why I did it the other way lol (revert)

src/core/frame.rs

@@ -6,7 +6,7 @@ pub struct Regioned {
 }
 
 impl<Ctx: 'static> Widget<Ctx> for Regioned {
-    fn draw(&self, mut painter: Painter<Ctx>) {
+    fn draw(&self, painter: &mut Painter<Ctx>) {
         painter.draw_within(&self.inner, self.region);
     }
 }

src/core/image.rs

@@ -7,7 +7,7 @@ pub struct Image {
 }
 
 impl<Ctx> Widget<Ctx> for Image {
-    fn draw(&self, mut painter: Painter<Ctx>) {
+    fn draw(&self, painter: &mut Painter<Ctx>) {
         if let Some(handle) = &self.handle {
             painter.draw_texture(handle);
         } else {

src/core/rect.rs

@@ -28,7 +28,7 @@ impl Rect {
 }
 
 impl<Ctx> Widget<Ctx> for Rect {
-    fn draw(&self, mut painter: Painter<Ctx>) {
+    fn draw(&self, painter: &mut Painter<Ctx>) {
         painter.write(RectPrimitive {
             color: self.color,
             radius: self.radius,

src/core/span.rs

@@ -6,7 +6,7 @@ pub struct Span {
 }
 
 impl<Ctx: 'static> Widget<Ctx> for Span {
-    fn draw(&self, mut painter: Painter<Ctx>) {
+    fn draw(&self, painter: &mut Painter<Ctx>) {
         let total = self.sums();
         let mut start = UIScalar::min();
         for (child, length) in &self.children {

src/core/stack.rs

@@ -5,7 +5,7 @@ pub struct Stack {
 }
 
 impl<Ctx> Widget<Ctx> for Stack {
-    fn draw(&self, mut painter: Painter<Ctx>) {
+    fn draw(&self, painter: &mut Painter<Ctx>) {
         for child in &self.children {
             painter.draw(child);
         }