Android safe area problems

[AntTheAlchemist]

A few things wrong:

1. Initial safe area is all zeros.

2. On some devices (Samsing S20) the WINDOW_SAFE_AREA_CHANGED event is a bit spammy:

0:10:04.903 WINDOW_SAFE_AREA_CHANGED 0, 0, 2178 x 1008
0:10:04.903 WINDOW_PIXEL_SIZE_CHANGED 2178 x 1008
0:10:04.903 WINDOW_RESIZED 2178 x 1008
0:10:04.894 WINDOW_SAFE_AREA_CHANGED 0, 0, 2400 x 1080
0:10:04.894 WINDOW_LEAVE_FULLSCREEN
---
0:09:41.194 WINDOW_SAFE_AREA_CHANGED 78, 72, 2178 x 1008
0:09:41.194 WINDOW_PIXEL_SIZE_CHANGED 2400 x 1080
0:09:41.194 WINDOW_RESIZED 2400 x 1080
0:09:41.167 WINDOW_SAFE_AREA_CHANGED 78, 72, 1956 x 936
0:09:41.167 WINDOW_ENTER_FULLSCREEN

3. Toggling fullscreen now causes a 1/3 second delay. Removing both setOnApplyWindowInsetsListener(this) removes the delay.

4. Safe area doesn't make much sense. It seems to be exactly the same area as non-fullscreen area, which doesn't take into account the curve at the bottom, maybe we're using the wrong settings?:

Here's the test code:

int main(int argc, char** argv) {
    SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
    SDL_Window *w = SDL_CreateWindow("Test", 640, 480, 0);
    SDL_Renderer *r = SDL_CreateRenderer(w, 0);
    SDL_bool running = SDL_TRUE; SDL_bool background = SDL_FALSE;
    while (running) {
        SDL_PumpEvents();
        SDL_Event event;
        while (SDL_PeepEvents(&event, 1, SDL_GETEVENT, SDL_EVENT_FIRST, SDL_EVENT_LAST) == 1) {
            switch(event.type) {
                case SDL_EVENT_KEY_UP:
                case SDL_EVENT_QUIT:
                    running = SDL_FALSE;
                    break;
                case SDL_EVENT_FINGER_UP:
                    SDL_SetWindowFullscreen(w, !(SDL_GetWindowFlags(w) & SDL_WINDOW_FULLSCREEN));
                    break;
                case SDL_EVENT_DID_ENTER_FOREGROUND:
                    background = SDL_FALSE;
                    break;
                case SDL_EVENT_WILL_ENTER_BACKGROUND:
                    background = SDL_TRUE;
                    break;
            }
        }
        if(!background) {
            SDL_SetRenderDrawColor(r, 128, 0, 0, SDL_ALPHA_OPAQUE);
            SDL_RenderClear(r);
            SDL_SetRenderDrawColor(r, 0, 128, 0, SDL_ALPHA_OPAQUE);
            SDL_Rect safe;
            SDL_GetWindowSafeArea(w, &safe);
            SDL_FRect fsafe = {safe.x, safe.y, safe.w, safe.h};
            SDL_RenderFillRect(r, &fsafe);
            SDL_RenderPresent(r);
        }
    }
    SDL_DestroyRenderer(r);
    SDL_DestroyWindow(w);
    SDL_Quit();
    return 0;
}