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/spinbutt.cpp

@@ -19,7 +19,7 @@
     #include "wx/utils.h"
 #endif
 
-#include "wx/gtk/private.h"
+#include <gtk/gtk.h>
 
 //-----------------------------------------------------------------------------
 // data
@@ -35,8 +35,6 @@ extern "C" {
 static void
 gtk_value_changed(GtkSpinButton* spinbutton, wxSpinButton* win)
 {
-    if (g_isIdle) wxapp_install_idle_handler();
-
     const double value = gtk_spin_button_get_value(spinbutton);
     const int pos = int(value);
     const int oldPos = win->m_pos;