[Bugfix] Fix NextUpdate.interval issue (#403)

Author: Kyle-Ye

Sources/OpenSwiftUICore/View/Graph/ViewGraph.swift

@@ -94,12 +94,15 @@ package final class ViewGraph: GraphHost {
 
     package struct NextUpdate {
         package private(set) var time: Time = .infinity
+
         private var _interval: Double = .infinity
+
         package var interval: Double {
-            _interval.isFinite ? .zero : _interval
+            _interval.isFinite ? _interval : .zero
         }
+
         package private(set) var reasons: Set<UInt32> = []
-        
+
         package mutating func at(_ next: Time) {
             time = next < time ? next : time
         }

Tests/OpenSwiftUICoreTests/View/Graph/ViewGraphTests.swift

@@ -0,0 +1,19 @@
+//
+//  ViewGraphTests.swift
+//  OpenSwiftUICoreTests
+
+@testable import OpenSwiftUICore
+import OpenSwiftUI_SPI
+import Testing
+
+struct ViewGraphTests {
+    struct NextUpdateTests {
+        typealias Update = ViewGraph.NextUpdate
+
+        @Test
+        func interval() {
+            let update = Update()
+            #expect(update.interval == .zero)
+        }
+    }
+}