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Created attachment 3495 [details]
ScheduleContextUpdates crashes for SDL_WINDOW_FULLSCREEN_DESKTOP windows

the function 

    ScheduleContextUpdates(SDL_WindowData *data)

in the file SDL_cocoawindow.m does NOT check if data is valid. My application crashes upon exiting with a EXC_BAD_ACCESS exception

this is on OSX 10.14 (which is not selectable in bugzilla...)

in attach is a simple application that just does this :


	SDL_Renderer* renderer;
	SDL_Init( SDL_INIT_EVERYTHING );
	//	TTF_Init();
	
	SDL_Window *window;        // Declare a pointer to an SDL_Window
	
	int dialog_w = 640;
	int dialog_h = 480;
	
	window = SDL_CreateWindow("Keystroke detection",SDL_WINDOWPOS_UNDEFINED,SDL_WINDOWPOS_UNDEFINED,dialog_w,dialog_h,SDL_WINDOW_FULLSCREEN_DESKTOP|SDL_WINDOW_SHOWN|SDL_WINDOW_BORDERLESS);
	renderer = SDL_CreateRenderer(window, -1, 0);
	
	
	SDL_Delay(2500);
	SDL_DestroyRenderer(renderer);
	SDL_Delay(2500);
	SDL_DestroyWindow(window);
	SDL_Delay(2500);
	SDL_Quit();


note : this ONLY happens if the window was created with SDL_WINDOW_FULLSCREEN_DESKTOP flags !!!


fix is simple : add these lines as first 2 lines in ScheduleContextUpdates implementation
    
	if (!data || data->window == NULL || data->nswindow == nil)
		return;