message: Fix sneaky bug with padding in flex layout
diff: @@ -74,8 +74,7 @@ where
  {
  let limits = limits.pad(padding);
  - let mut total_non_fill =
  - spacing as f32 * (items.len() as i32 - 1).max(0) as f32;
  + let mut total_non_fill = spacing * items.len().saturating_sub(1) as f32;
  let mut fill_sum = 0;
  let mut cross = axis.cross(limits.min());
  @@ -166,13 +165,11 @@ where
  main += axis.main(size);
  }
  - let (width, height) = axis.pack(main, cross);
  + let (width, height) = axis.pack(main - padding, cross);
  let size = limits.resolve(Size::new(width, height));
  - let (padding_x, padding_y) = axis.pack(padding, padding * 2.0);
  -
  Node::with_children(
  - Size::new(size.width + padding_x, size.height + padding_y),
  + Size::new(size.width + padding * 2.0, size.height + padding * 2.0),
  nodes,
  )
  }
  