delete the TLW used by taskbar icons instead of destroying it to avoid hang on exit if there are no other windows left in the program

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50428 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/taskbar.cpp

@@ -152,7 +152,13 @@ wxTaskBarIcon::~wxTaskBarIcon()
         RemoveIcon();
 
     if ( m_win )
-        m_win->Destroy();
+    {
+        // we must use delete and not Destroy() here because the latter will
+        // only schedule the window to be deleted during the next idle event
+        // processing but we may not get any idle events if there are no other
+        // windows left in the program
+        delete m_win;
+    }
 }
 
 // Operations