#include <SDL.h>
#include <stdio.h>

const int WINDOW_WIDTH = 640;
const int WINDOW_HEIGHT = 480;

int main(int argc, char* argv[])
{
    SDL_Window *window = NULL;
    SDL_Renderer *renderer = NULL;
    int quit = 0;
    Uint32 flags = SDL_WINDOW_SHOWN;

    SDL_Init(SDL_INIT_VIDEO);
    SDL_CreateWindowAndRenderer(WINDOW_WIDTH, WINDOW_HEIGHT, flags, &window, &renderer);

    SDL_SetWindowMinimumSize(window, WINDOW_WIDTH, WINDOW_HEIGHT);
    SDL_RenderSetVSync(renderer, 1);

    while (!quit)
    {
        SDL_Event e;
        while (SDL_PollEvent(&e) > 0)
        {
          switch (e.type)
          {
            case SDL_QUIT:
                quit = 1;
                break;
            case SDL_KEYDOWN:
                if (e.key.keysym.scancode == SDL_SCANCODE_F) {
                    // press "f" to enable fullscreen
                    SDL_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN_DESKTOP);
                } if (e.key.keysym.scancode == SDL_SCANCODE_G) {
                    // press "g" to disable fullscreen
                    SDL_SetWindowFullscreen(window, 0);

                    // Problem call is here:
                    SDL_SetWindowMinimumSize(window, WINDOW_WIDTH, WINDOW_HEIGHT);
                }
                break;
            }
        }

        SDL_RenderClear(renderer);
        SDL_RenderPresent(renderer);
    }

    SDL_DestroyWindow(window);
    SDL_Quit();
    return 0;
}