Gtk-CRITICAL: gtk_pixmap_set: assertion....

[Ang Bodhi <angbodhi pacific net sg>]

Hi,

My application is getting the following error messages when it is closed by
clicking on its close window button:

(qmorf:27039): Gdk-CRITICAL **: gdk_drawable_get_depth: assertion
`GDK_IS_DRAWABLE (drawable)' failed
 
(qmorf:27039): Gtk-CRITICAL **: gtk_pixmap_set: assertion
`gdk_colormap_get_visual (gtk_widget_get_colormap (GTK_WIDGET
(pixmap)))->depth == gdk_drawable_get_depth (GDK_DRAWABLE (val))' failed
 
I try some debugging and find that on closing the application, the function
gtk_pixmap_finalize() was called:

static void
gtk_pixmap_finalize (GObject *object)
{
  gtk_pixmap_set (GTK_PIXMAP (object), NULL, NULL);

  G_OBJECT_CLASS (parent_class)->finalize (object);
}

The gtk_pixmap_finalize() pass NULL as the val parameter on a call to
gtk_pixmap_set(), which has some parameter checking code:

void
gtk_pixmap_set (GtkPixmap *pixmap,
                GdkPixmap *val,
                GdkBitmap *mask)
{
  gint width;
  gint height;
  gint oldwidth;
  gint oldheight;

  g_return_if_fail (GTK_IS_PIXMAP (pixmap));
  g_return_if_fail (gdk_colormap_get_visual (gtk_widget_get_colormap
(GTK_WIDGET (pixmap)))->depth == gdk_drawable_get_depth (GDK_DRAWABLE
(val)));
  ........
}

It appear that both the error messages I get is due to the result of val
argument being NULL. Even if my application simply connect the delete_event
and destroy signal as follow, I still get the error messages:

    g_signal_connect_swapped (mainWidget, "delete_event",
                              G_CALLBACK (gtk_widget_destroy),
                              mainWidget);
    g_signal_connect (mainWidget, "destroy",
                      G_CALLBACK (gtk_main_quit), NULL);

I'm currently using Gtk+-2.8.14. Is the above problem a bug? If it is not a
bug, how can I avoid the messages?

Thanks,
Bodhi

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