message: removed unnecessary flush in Canvas::to_rgba8
diff: @@ -154,11 +154,6 @@ where
  /// Dumps the flipped `Canvas`'s data to a `Vec` of `u8` RBGA8 values.
  pub fn to_rgba8(&self, ctx: &mut Context) -> GameResult<Vec<u8>> {
  - // first flush to make sure the canvas is up to date before being serialized
  - // fixes https://github.com/ggez/ggez/issues/813
  - let gfx = &mut ctx.gfx_context;
  - gfx.encoder.flush(&mut *gfx.device);
  -
  let mut pixel_data = self.image.to_rgba8(ctx)?;
  flip_pixel_data(
  &mut pixel_data,
  