Update PreferenceKey and List (#129)

Author: Kyle-Ye

Sources/OpenSwiftUI/Core/Graph/GraphHost.swift

@@ -9,6 +9,7 @@
 internal import COpenSwiftUICore
 internal import OpenGraphShims
 @_spi(ForOpenSwiftUIOnly) import OpenSwiftUICore
+@_spi(Private) import OpenSwiftUICore
 
 private let waitingForPreviewThunks = EnvironmentHelper.bool(for: "XCODE_RUNNING_FOR_PREVIEWS")
 private var blockedGraphHosts: [Unmanaged<GraphHost>] = []
@@ -170,7 +171,7 @@ class GraphHost {
     }
 
     final func updatePreferences() -> Bool {
-        let seed = hostPreferenceValues.value?.mergedSeed ?? .empty
+        let seed = hostPreferenceValues.value?.seed ?? .empty
         let lastSeed = lastHostPreferencesSeed
         let didUpdate = seed.isInvalid || lastSeed.isInvalid /*|| (seed != lastSeed)*/
         lastHostPreferencesSeed = seed

Sources/OpenSwiftUI/Data/Preference/AnyPreferenceKey.swift

@@ -195,7 +195,7 @@ private struct MergePreferenceKeys: Rule, AsyncAttribute {
         guard let rhs else {
             return result
         }
-        result.merge(rhs)
+        // result.merge(rhs)
         return result
     }
 }

Sources/OpenSwiftUI/Data/Preference/HostPreferencesKey.swift

@@ -78,7 +78,7 @@ struct HostPreferencesCombiner: Rule, AsyncAttribute {
                     continue
                 }
                 guard let values = child.$values,
-                      let listValue = values.value.valueIfPresent(key) else {
+                      let listValue = values.value.valueIfPresent(for: key) else {
                     continue
                 }
                 if initialValue {

Sources/OpenSwiftUI/Data/Preference/PreferenceBridge.swift

@@ -31,6 +31,6 @@ struct PreferencesInputs {
 
     @inline(__always)
     mutating func merge(_ preferenceKeys: PreferenceKeys) {
-        keys.merge(preferenceKeys)
+        // keys.merge(preferenceKeys)
     }
 }

Sources/OpenSwiftUI/Data/Preference/PreferenceKey.swift

@@ -95,3 +95,19 @@ extension PreferencesOutputs {
         #endif
     }
 }
+
+extension _ViewOutputs {
+    @inline(__always)
+    var hostPreferences: Attribute<PreferenceList>? {
+        get { self[HostPreferencesKey.self] }
+        set { self[HostPreferencesKey.self] = newValue }
+    }
+}
+
+extension PreferencesOutputs {
+    @inline(__always)
+    var hostPreferences: Attribute<PreferenceList>? {
+        get { self[HostPreferencesKey.self] }
+        set { self[HostPreferencesKey.self] = newValue }
+    }
+}