Enable/Disable a button and mouse clicks

[Gabriele Greco <gabriele greco darts it>]

I've found that if I disable a button after a click on it 
(gtk_widget_set_sensitive(button, FALSE)), and then enable it back after 
a timed event or something else occurs (...set_sensitive(button, TRUE) 
), I'm unable to click on the button with the mouse pointer unless I 
exit with the pointer from the button rectangle and enter back in it.

This is a minimal example showing this strange behaviour, I think it's a 
wanted behaviour and not a bug (I found this behaviour in GTK 2.6, 2.8, 
but not in GTK 2.4), but it's not what I want from my button, there is 
any workaround for it?

#include <gtk/gtk.h>
#include <stdio.h>

int do_timeout(GtkWidget *w)
{
    printf("Timed out, enabling button\n");
    gtk_widget_set_sensitive(w, TRUE);
    return 0;
}

int clicked(GtkWidget *w)
{
    printf("Button clicked!\n");
    gtk_widget_set_sensitive(w, FALSE);
    g_timeout_add(2000, do_timeout, w);
}

int main(int argc, char *argv[])
{
    gtk_init(&argc, &argv);
    GtkWidget *w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    GtkWidget *b = gtk_button_new_with_label("Test");
    gtk_container_add(GTK_CONTAINER(w), b);
    g_signal_connect(b, "clicked", clicked, NULL);
    gtk_widget_show_all(w);
    gtk_main();
}

Bye,
 Gabry