Bug 199488

In 10.15 we noticed a regression where WKWebView was not rendering in our application and just shows a blank view. In 10.14.5 WKWebView is rendering with the same code. The issue is that when any subview in your window uses CoreImage filters, it breaks future WKWebView that are added to the window from rendering. I am not sure what change in WebKit caused this to stop working, but I can repro by running the latest WebKit code on my 10.14.5 machine. This does not repro when you change the order and first call -[WKWebView loadRequest:] before adding the web view to the window. NSView *ciLayerView = [[NSView alloc] initWithFrame:NSMakeRect(0, 0, 1, 1)]; ciLayerView.wantsLayer = YES; ciLayerView.layerUsesCoreImageFilters = YES; [[self view] addSubview:ciLayerView]; dispatch_async(dispatch_get_main_queue(), ^{ WKWebView *webView = [[WKWebView alloc] initWithFrame:NSMakeRect(100, 100, 400, 400)]; [self.view addSubview:webView]; [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.bing.com"]]]; });