Bugfix: New document sometimes cannot be opened.(While another new do…

src/Gemini.Modules.CodeEditor/ViewModels/CodeEditorViewModel.cs

@@ -105,7 +105,10 @@ protected override void OnViewLoaded(object view)
         public override bool Equals(object obj)
         {
             var other = obj as CodeEditorViewModel;
-            return other != null && string.Compare(_path, other._path) == 0;
+            // Compare filename if path is null (and other._path is also null)
+            return other != null && string.Compare(_path, other._path) == 0 &&
+                (_path != null || (other._path == null && string.Compare(_fileName, other._fileName)==0) ); 
+
         }
 
         public void Save()
@@ -129,4 +132,4 @@ private void SetLanguage(ILanguageDefinition languageDefinition)
             }
         }
     }
-}
+}

src/Gemini/Modules/MainMenu/Models/CommandMenuItem.cs

@@ -56,6 +56,18 @@ public CommandMenuItem(Command command, StandardMenuItem parent)
             _parent = parent;
 
             _listItems = new List<StandardMenuItem>();
+
+            _command.PropertyChanged += (s, e) =>
+            {
+                if (e.PropertyName == "Visible" || e.PropertyName == "Checked")
+                {
+                    NotifyOfPropertyChange("Is" + e.PropertyName);
+                }
+                else if (e.PropertyName == "Text" || e.PropertyName == "IconSource")
+                {
+                    NotifyOfPropertyChange(e.PropertyName);
+                }
+            };
         }
 
         CommandDefinitionBase ICommandUiItem.CommandDefinition