去除切换里的窗口显示

SpineViewer/Forms/SpinePreviewFullScreenForm.cs

@@ -1,4 +1,5 @@
-using System;
+using SpineViewer.Natives;
+using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.ComponentModel.Design;
@@ -20,5 +21,15 @@ namespace SpineViewer.Forms
         {
             InitializeComponent();
         }
+
+        protected override CreateParams CreateParams
+        {
+            get
+            {
+                var cp = base.CreateParams;
+                cp.ExStyle |= Win32.WS_EX_TOOLWINDOW;
+                return cp;
+            }
+        }
     }
 }