Add optional bring-to-front on file change

MarkdownViewer/App/MarkdownViewerApp.swift

@@ -5,6 +5,7 @@ struct MarkdownViewerApp: App {
     @NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
     @StateObject private var recentFilesStore = RecentFilesStore.shared
     @ObservedObject private var editorSettings = ExternalEditorSettings.shared
+    @AppStorage("autoRaiseOnFileChange") private var autoRaiseOnFileChange = false
 
     var body: some Scene {
         WindowGroup {
@@ -102,6 +103,10 @@ struct MarkdownViewerApp: App {
                     appDelegate.resetZoom()
                 }
                 .keyboardShortcut("0", modifiers: .command)
+
+                Divider()
+
+                Toggle("Bring to Front on File Change", isOn: $autoRaiseOnFileChange)
             }
         }
         Settings {

MarkdownViewer/ViewModels/DocumentState.swift

@@ -1,3 +1,4 @@
+import AppKit
 import Combine
 import CoreGraphics
 import Foundation
@@ -138,6 +139,9 @@ class DocumentState: ObservableObject {
                 self.lastModificationDate = newModDate
                 self.reload()
                 withAnimation(.easeInOut(duration: 0.2)) { self.fileChanged = true }
+                if UserDefaults.standard.bool(forKey: "autoRaiseOnFileChange") {
+                    NSApplication.shared.activate(ignoringOtherApps: true)
+                }
             }
         }