最近精简代码，有些bug，修复

AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/SelectableViewModelBase.cs

@@ -191,6 +191,22 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
         }
 
+        private bool _showText;
+        public bool ShowText
+        {
+            get
+            {
+                return _showText;
+            }
+            set
+            {
+                if (!SetProperty(ref _showText, value))
+                {
+                    RaisePropertyChanged(nameof(ShowText));
+                }
+            }
+        }
+
         private bool _visible = true;
         public bool Visible
         {
@@ -343,7 +359,6 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
         }
 
-
         protected virtual void ClearText()
         {