Explicitly recreate LogStore on Reset Layout Cache

This fixes many (but not all) issues described in #10, particularly on iOS:

- On iOS, the padding, background, and HStack examples work correctly now, except that the initial proposed size to the root view of the subtree is equal to the eventual actual size, not the available size of the container view. I don't understand this yet.
- On iOS, the fixedSize example is still weirdly broken: the Text child of the .fixedSize() doesn't appear in the layout log. A caching thing?
- On macOS it’s still very broken. I don't understand why macOS behaves so differently.

Author: ole

Sources/LayoutInspector/DebugLayout.swift

@@ -4,7 +4,7 @@ import SwiftUI
 extension View {
     /// Inspect the layout for this subtree.
     @MainActor public func inspectLayout() -> some View {
-        modifier(InspectLayout(logStore: LogStore()))
+        modifier(InspectLayout())
     }
 
     /// Monitor the layout proposals and responses for this view and add them

Sources/LayoutInspector/DebugLayoutImpl.swift

@@ -3,8 +3,8 @@ import SwiftUI
 @available(macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0, *)
 @MainActor
 struct InspectLayout: ViewModifier {
-    // Don't observe LogStore. Avoids an infinite update loop.
-    var logStore: LogStore
+    // Don't observe LogStore. Avoids an infinite update loop when store publishes changes.
+    @State private var logStore: LogStore = .init()
     @State private var selectedView: String? = nil
     @State private var generation: Int = 0
     @State private var inspectorFrame: CGRect = CGRect(x: 0, y: 0, width: 300, height: 300)
@@ -34,6 +34,9 @@ struct InspectLayout: ViewModifier {
                 .coordinateSpace(name: Self.coordSpaceName)
         }
         .environment(\.debugLayoutActions, logStore.actions)
+        .onChange(of: generation) { newValue in
+            logStore = LogStore()
+        }
     }
 
     @ViewBuilder private var inspectorUI: some View {