improve:墨迹渲染

Ink Canvas/MainWindow_cs/MW_SimulatePressure&InkToShape.cs

@@ -900,12 +900,13 @@ namespace Ink_Canvas
 
                     bool InkToShapeProcess()
                     {
-                        var engineMode = ShapeRecognitionRouter.FromSettingsInt(Settings.InkToShape.ShapeRecognitionEngine);
-                        if (ShapeRecognitionRouter.ResolveUseWinRt(engineMode))
-                        {
+                        // WinRT 与非 WinRT 均延后到 Dispatcher 上异步执行：在 StrokeCollected 内对
+                        // InkToShapeProcessCoreAsync 同步 GetResult() 会长时间阻塞 UI 线程（抬笔卡顿）；
+                        // WinRT 路径若同步等待还可能与贴回 UI 的延续死锁（见类注释 InkToShapeSerial）。
                         var strokeHw = strokeForHandwritingBeautify;
                         var preBrushHwPts = preBrushHandwritingPoints;
                         var wsTail = wasStraightened;
+                        // ApplicationIdle：在更高优先级（布局/输入/本帧渲染）之后执行，减轻抬笔瞬间主线程“顶死”感。
                         Dispatcher.BeginInvoke(new Action(async () =>
                         {
                             try
@@ -919,24 +920,10 @@ namespace Ink_Canvas
                             {
                                 System.Diagnostics.Debug.WriteLine(ex);
                             }
-                            }), DispatcherPriority.Normal);
+                        }), DispatcherPriority.ApplicationIdle);
                         return true;
                     }
 
-                        try
-                        {
-                            InkToShapeProcessCoreAsync().GetAwaiter().GetResult();
-                        }
-                        catch (Exception ex)
-                        {
-                            System.Diagnostics.Debug.WriteLine(ex);
-                        }
-
-                        if (Settings.InkToShape.EnableWinRtHandwritingStrokeBeautify)
-                            ScheduleHandwritingGlyphReplaceAfterStrokeCollected(strokeForHandwritingBeautify, isBoardBrushStroke, preBrushHandwritingPoints);
-                        return false;
-                    }
-
                     if (InkToShapeProcess())
                         return;
                 }