Move Vulkan context/rendering_device destruction to windowWillClose notification.

platform/osx/os_osx.mm

@@ -282,6 +282,8 @@ static NSCursor *cursorFromSelector(SEL selector, SEL fallback = nil) {
 	//_Godotwindow* window;
 }
 
+- (void)windowWillClose:(NSNotification *)notification;
+
 @end
 
 @implementation GodotWindowDelegate
@@ -294,6 +296,24 @@ static NSCursor *cursorFromSelector(SEL selector, SEL fallback = nil) {
 	return NO;
 }
 
+- (void)windowWillClose:(NSNotification *)notification {
+#if defined(VULKAN_ENABLED)
+	if (OS_OSX::singleton->video_driver_index == OS::VIDEO_DRIVER_VULKAN) {
+
+		if (OS_OSX::singleton->rendering_device_vulkan) {
+			OS_OSX::singleton->rendering_device_vulkan->finalize();
+			memdelete(OS_OSX::singleton->rendering_device_vulkan);
+			OS_OSX::singleton->rendering_device_vulkan = NULL;
+		}
+
+		if (OS_OSX::singleton->context_vulkan) {
+			memdelete(OS_OSX::singleton->context_vulkan);
+			OS_OSX::singleton->context_vulkan = NULL;
+		}
+	}
+#endif
+}
+
 - (void)windowDidEnterFullScreen:(NSNotification *)notification {
 	OS_OSX::singleton->zoomed = true;
 
@@ -1626,19 +1646,6 @@ void OS_OSX::finalize() {
 			memdelete(context_gles2);
 	}
 #endif
-#if defined(VULKAN_ENABLED)
-	if (video_driver_index == VIDEO_DRIVER_VULKAN) {
-
-		if (rendering_device_vulkan) {
-			rendering_device_vulkan->finalize();
-			memdelete(rendering_device_vulkan);
-		}
-
-		if (context_vulkan)
-			memdelete(context_vulkan);
-
-	}
-#endif
 
 	CFNotificationCenterRemoveObserver(CFNotificationCenterGetDistributedCenter(), NULL, kTISNotifySelectedKeyboardInputSourceChanged, NULL);
 	CGDisplayRemoveReconfigurationCallback(displays_arrangement_changed, NULL);