Undo WIP

MarkdownViewer/ContentView.swift

@@ -185,8 +185,10 @@ struct MarkdownEditor: NSViewRepresentable {
         textView.font = NSFont.monospacedSystemFont(ofSize: 14, weight: .regular)
         textView.textColor = NSColor.textColor
         textView.backgroundColor = NSColor.textBackgroundColor
+        textView.allowsUndo = true
         textView.string = text
         
+        
         // Properly set up the scroll view hierarchy first
         scrollView.borderType = .noBorder
         scrollView.hasVerticalScroller = true
@@ -217,6 +219,7 @@ struct MarkdownEditor: NSViewRepresentable {
         
         if textView.string != text {
             print("MarkdownEditor: Updating text from \(textView.string.count) to \(text.count) characters")
+            
             textView.string = text
         }
     }

MarkdownViewer/MarkdownViewerApp.swift

@@ -62,6 +62,20 @@ struct MarkdownViewerApp: App {
                     }
                 }
             }
+            
+            CommandGroup(replacing: .undoRedo) {
+                Button("Undo") {
+                    print("Menu: Undo clicked, sending action to: \(NSApp.keyWindow?.firstResponder?.className ?? "nil")")
+                    NSApp.sendAction(#selector(UndoManager.undo), to: nil, from: nil)
+                }
+                .keyboardShortcut("z", modifiers: .command)
+                
+                Button("Redo") {
+                    print("Menu: Redo clicked, sending action to: \(NSApp.keyWindow?.firstResponder?.className ?? "nil")")
+                    NSApp.sendAction(#selector(UndoManager.redo), to: nil, from: nil)
+                }
+                .keyboardShortcut("z", modifiers: [.command, .shift])
+            }
         }
     }