message: respect vsync conf
diff: @@ -396,7 +396,11 @@ impl GraphicsContext {
  format: self.surface_format,
  width: size.width,
  height: size.height,
  - present_mode: wgpu::PresentMode::Mailbox,
  + present_mode: if self.vsync {
  + wgpu::PresentMode::Fifo
  + } else {
  + wgpu::PresentMode::Mailbox
  + },
  },
  );
  }
  