Layout system rewrite

Benchmarks/LayoutPerformanceBenchmark/LayoutPerformanceBenchmark.swift

@@ -34,17 +34,17 @@ struct Benchmarks {
         }
 
         @MainActor
-        func updateNode<V: View>(_ node: ViewGraphNode<V, DummyBackend>, _ size: SIMD2<Int>) {
-            _ = node.update(proposedSize: size, environment: environment, dryRun: true)
-            _ = node.update(proposedSize: size, environment: environment, dryRun: false)
+        func updateNode<V: View>(_ node: ViewGraphNode<V, DummyBackend>, _ size: ProposedViewSize) {
+            _ = node.computeLayout(proposedSize: size, environment: environment)
+            _ = node.commit()
         }
 
         #if BENCHMARK_VIZ
             var benchmarkVisualizations: [(name: String, main: () -> Never)] = []
         #endif
 
         @MainActor
-        func benchmarkLayout<V: TestCaseView>(of viewType: V.Type, _ size: SIMD2<Int>, _ label: String) {
+        func benchmarkLayout<V: TestCaseView>(of viewType: V.Type, _ size: ProposedViewSize, _ label: String) {
             #if BENCHMARK_VIZ
                 benchmarkVisualizations.append((
                     label,
@@ -62,8 +62,8 @@ struct Benchmarks {
         }
 
         // Register benchmarks
-        benchmarkLayout(of: GridView.self, SIMD2(800, 800), "grid")
-        benchmarkLayout(of: ScrollableMessageListView.self, SIMD2(800, 800), "message list")
+        benchmarkLayout(of: GridView.self, ProposedViewSize(800, 800), "grid")
+        benchmarkLayout(of: ScrollableMessageListView.self, ProposedViewSize(800, 800), "message list")
 
         #if BENCHMARK_VIZ
             let names = benchmarkVisualizations.map(\.name).joined(separator: " | ")

Examples/Sources/WindowingExample/WindowingApp.swift

@@ -177,6 +177,8 @@ struct WindowingApp: App {
                     }
 
                     Image(Bundle.module.bundleURL.appendingPathComponent("Banner.png"))
+                        .resizable()
+                        .aspectRatio(contentMode: .fit)
 
                     Divider()
 

Sources/AppKitBackend/AppKitBackend.swift

@@ -31,12 +31,14 @@ public final class AppKitBackend: AppBackend {
         // We assume that all scrollers have their controlSize set to `.regular` by default.
         // The internet seems to indicate that this is true regardless of any system wide
         // preferences etc.
-        Int(
+        let result = Int(
             NSScroller.scrollerWidth(
                 for: .regular,
                 scrollerStyle: NSScroller.preferredScrollerStyle
             ).rounded(.awayFromZero)
         )
+        print(result)
+        return result
     }
 
     private let appDelegate = NSCustomApplicationDelegate()
@@ -528,7 +530,7 @@ public final class AppKitBackend: AppBackend {
     ) -> SIMD2<Int> {
         if let proposedFrame, proposedFrame.x == 0 {
             // We want the text to have the same height as it would have if it were
-            // one pixel wide so that the layout doesn't suddely jump when the text
+            // one pixel wide so that the layout doesn't suddenly jump when the text
             // reaches zero width.
             let size = size(
                 of: text,