use "event" signal emission hook to install idle handler for many events

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40854 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/dnd.cpp

@@ -706,8 +706,7 @@ extern "C" {
 static gint
 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 {
-    if (g_isIdle)
-        wxapp_install_idle_handler();
+    // don't need to install idle handler, its done from "event" signal
 
     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );