Clip main surface to rounded geometry to prevent corner overflow

MainWindow.xaml.cs

@@ -144,6 +144,7 @@ namespace C4IT_CustomerPanel
                 FormHelper.GetLocation((int)this.Width, (int)this.Height, (double)ConfigSettings.local_currentDPI / 96);
 
                 SetAppearance(true);
+                UpdateMainSurfaceClip();
 
                 SetLocation();
                 CustomerPanelSecurePassword.Init();
@@ -2157,9 +2158,23 @@ namespace C4IT_CustomerPanel
 
         private void Window_SizeChanged(object sender, SizeChangedEventArgs e)
         {
+            UpdateMainSurfaceClip();
             SetLocation();
         }
 
+        private void UpdateMainSurfaceClip()
+        {
+            if (MainWindowSurface == null)
+                return;
+
+            double width = MainWindowSurface.ActualWidth;
+            double height = MainWindowSurface.ActualHeight;
+            if (width <= 0 || height <= 0)
+                return;
+
+            MainWindowSurface.Clip = new RectangleGeometry(new Rect(0, 0, width, height), 20, 20);
+        }
+
     }
 
     public class cMainFunctionInfo