[Webkit-unassigned] [Bug 199488] New: WKWebView fails to render when another view uses CoreImage filters

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199488

            Bug ID: 199488
           Summary: WKWebView fails to render when another view uses
                    CoreImage filters
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dasau at microsoft.com

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"]]];
});

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