Reorganize idle system code.

Installing idle handler from GTK callbacks is no longer necessary.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45537 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/tglbtn.cpp

@@ -28,9 +28,6 @@ extern bool      g_blockEventsOnDrag;
 extern "C" {
 static void gtk_togglebutton_clicked_callback(GtkWidget *WXUNUSED(widget), wxToggleButton *cb)
 {
-    if (g_isIdle)
-        wxapp_install_idle_handler();
-
     if (!cb->m_hasVMT || g_blockEventsOnDrag)
         return;