Fix winit transformed input for negative positions

src/backend/winit.rs

@@ -360,21 +360,27 @@ impl PointerMotionAbsoluteEvent for WinitMouseMovedEvent {
     }
 
     fn x_transformed(&self, width: u32) -> u32 {
+        cmp::max(
             (self.x * width as f64
                 / self.window
                     .window()
                     .get_inner_size()
                     .unwrap_or((width, 0))
-                .0 as f64) as u32
+                    .0 as f64) as i32,
+            0,
+        ) as u32
     }
 
     fn y_transformed(&self, height: u32) -> u32 {
+        cmp::max(
             (self.y * height as f64
                 / self.window
                     .window()
                     .get_inner_size()
                     .unwrap_or((0, height))
-                .1 as f64) as u32
+                    .1 as f64) as i32,
+            0,
+        ) as u32
     }
 }