Fixed bug #14173 - Android / SDL_Renderer Vulkan : going background / foreground produces a black screen.

need to recreate the swap chain + send SDL_EVENT_RENDER_DEVICE_RESET event

src/render/vulkan/SDL_render_vulkan.c

@@ -2467,7 +2467,7 @@ static VkResult VULKAN_CreateWindowSizeDependentResources(SDL_Renderer *renderer
 
     result = VULKAN_CreateSwapChain(renderer, w, h);
     if (result != VK_SUCCESS) {
-        rendererData->recreateSwapchain = VK_TRUE;
+        rendererData->recreateSwapchain = true;
     }
 
     rendererData->viewportDirty = true;
@@ -2517,6 +2517,13 @@ static void VULKAN_WindowEvent(SDL_Renderer *renderer, const SDL_WindowEvent *ev
     if (event->type == SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED) {
         rendererData->recreateSwapchain = true;
     }
+
+#ifdef SDL_PLATFORM_ANDROID
+    // Prevent black screen when app returns from background
+    if (event->type == SDL_EVENT_WINDOW_RESTORED) {
+        VULKAN_HandleDeviceLost(renderer);
+    }
+#endif
 }
 
 static bool VULKAN_SupportsBlendMode(SDL_Renderer *renderer, SDL_BlendMode blendMode)