SDL2: SDL_Delay() makes the window bar hidden on El Capitan

Env: 
SDL 2.0.4; 
OS X El Capitan 10.11.5 (15F34); 
clang 7.3

After calling the SDL_Delay(), the window bar is hidden and a white bar is shown instead. 
I'm not sure if this is a feature or bug. Or I missed something?

Thank you!

Here is my code:


Code:

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <SDL2/SDL.h>

const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;

int main(int argc, const char *argv[])
{
  if( SDL_Init( SDL_INIT_VIDEO ) < 0 )
  {
    printf( "SDL could not initialize! SDL_Error: %s\n", SDL_GetError() );
  }
  bool quit = false;
  SDL_Event event;
  SDL_Window* window = NULL;
  window = SDL_CreateWindow("Test SDL", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
  SDL_Renderer * renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);

  SDL_SetRenderDrawColor(renderer, 255, 254, 255, 255 );
  SDL_RenderClear(renderer);

  SDL_RenderPresent(renderer);
  SDL_Delay(5000); // window bar is hidden, a white blank bar is shown instead.

  while (!quit) // window bar is shown right now.
  {
    SDL_WaitEvent(&event);
    switch (event.type)
    {
      case SDL_QUIT:
        quit = true;
        break;
    }
  }


  SDL_DestroyRenderer(renderer);
  SDL_DestroyWindow(window);

	SDL_Quit();
  return 0;
}


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