完善画布焦点转移逻辑

SpineViewer/ViewModels/MainWindow/SFMLRendererViewModel.cs

@@ -275,9 +275,12 @@ namespace SpineViewer.ViewModels.MainWindow
 
                                 hit = true;
 
-                                // 不管点到了哪个, 都清空原先选中的, 改为只选中这一次点的, 强制触发一次选中项改变, 以及焦点转移到模型列表
+                                // 如果点到了没被选中的东西, 则清空原先选中的, 改为只选中这一次点的
+                                if (!sp.IsSelected)
+                                {
                                     RequestSelectionChanging?.Invoke(this, new(NotifyCollectionChangedAction.Reset));
                                     RequestSelectionChanging?.Invoke(this, new(NotifyCollectionChangedAction.Add, sp));
+                                }
                                 break;
                             }
 

SpineViewer/Views/MainWindow.xaml.cs

@@ -56,7 +56,7 @@ public partial class MainWindow : Window
     {
         var vm = _vm.SFMLRendererViewModel;
         _renderPanel.CanvasMouseWheelScrolled += vm.CanvasMouseWheelScrolled;
-        _renderPanel.CanvasMouseButtonPressed += vm.CanvasMouseButtonPressed;
+        _renderPanel.CanvasMouseButtonPressed += (s, e) => { vm.CanvasMouseButtonPressed(s, e); _spinesListView.Focus(); }; // 用户点击画布后强制转移焦点至列表
         _renderPanel.CanvasMouseMove += vm.CanvasMouseMove;
         _renderPanel.CanvasMouseButtonReleased += vm.CanvasMouseButtonReleased;
 
@@ -193,9 +193,6 @@ public partial class MainWindow : Window
             default:
                 break;
         }
-
-        // 选中项发生变化时转移焦点到列表
-        _spinesListView.Focus();
     }
 
     private void SpinesListView_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)