_UIHostingView deinit crash

[Kyle-Ye]

@MainActor
@Test
func testDemo() throws {
    struct ContentView: View {
        var name = ""
        var body: some View {
            AnyView(EmptyView())
        }
    }
    let vc = UIHostingController(rootView: ContentView())
    vc.triggerLayout()
}
extension UIHostingController {
    func triggerLayout() {
        let window = UIWindow(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
        window.rootViewController = self
        window.makeKeyAndVisible()
        view.layoutSubviews()
    }
}

Commit Hash: a166851

[Kyle-Ye]

Workaround this partially by #88

[Kyle-Ye]

(lldb) settings set target.language objc

# OpenSwiftUI:
# GraphHost.init
(lldb) expr (int)CFGetRetainCount((CFTypeRef)0x6000002847c0)
(int) $0 = 3
(lldb) expr (int)CFGetRetainCount((CFTypeRef)0x6000002848e0)
(int) $1 = 3

(lldb) mr 0x6000002847c0
0x6000002847c0: 0x01000001ec0cdb09 0x0003000000007080
0x6000002847d0: 0x000060000290dce0 0x0000000000000000
0x6000002847e0: 0x00000001e6b40bc8 0x0000000000000003
0x6000002847f0: 0x0000000103a08318 0x0000000000000000
(lldb) mr 0x6000002848e0
0x6000002848e0: 0x01000001ec0cdb09 0x0003000000007080
0x6000002848f0: 0x000060000290da40 0x0000000000000000
0x600000284900: 0x0000000000000000 0x0000000000000000
0x600000284910: 0x0000000000000000 0x0000000000000000

# GraphHost.invalidate
(lldb) expr (int)CFGetRetainCount((CFTypeRef)0x6000002847c0)
(int) $0 = 1
(lldb) expr (int)CFGetRetainCount((CFTypeRef)0x6000002848e0)
(int) $1 = 1

# After globalSubgraph.invalidate
# 0x6000002847c0 becomes invalid

# SwiftUI:

# GraphHost.invalidate
(lldb) expr (int)CFGetRetainCount((CFTypeRef)0x0000600000204020)
(int) $1 = 1
(lldb) expr (int)CFGetRetainCount((CFTypeRef)0x00006000002040a0)
(int) $2 = 4

# After globalSubgraph.invalidate
# 0x0000600000204020 is still valid and ref count is 1

[Kyle-Ye]

The root cause is anywhere else. But fixing the any view issue (#204) on EditModeScopeModifier can temporary workaround it.

[Kyle-Ye]

Blocked by OpenGraph's implementation on Subgraph.invalidate