enhance: close #1390

src/Shared/HandyControl_Shared/Controls/Growl/Growl.cs

@@ -396,7 +396,7 @@ public class Growl : Control
     /// <param name="growlInfo"></param>
     private static void Show(GrowlInfo growlInfo)
     {
-        Application.Current.Dispatcher?.Invoke(
+        (Application.Current.Dispatcher ?? growlInfo.Dispatcher)?.Invoke(
 #if NET40
             new Action(
 #endif

src/Shared/HandyControl_Shared/Data/Info/GrowlInfo.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Windows;
 using System.Windows.Media;
+using System.Windows.Threading;
 
 namespace HandyControl.Data;
 
@@ -37,4 +38,6 @@ public class GrowlInfo
     public string Token { get; set; }
 
     public FlowDirection FlowDirection { get; set; }
+
+    public Dispatcher Dispatcher { get; set; }
 }