leak in gtkplotcanvas

I noticed gtk_plot_canvas_destroy() is not unreffing the pixmap.

I added these lines:

  if( plot_canvas->pc ){
     gtk_object_unref(GTK_OBJECT(plot_canvas->pc));
     plot_canvas->pc = NULL;
  }
+  if( plot_canvas->pixmap ){
+     gdk_pixmap_unref(plot_canvas->pixmap);
+     plot_canvas->pixmap = NULL;
+  }

  if (GTK_OBJECT_CLASS (parent_class)->destroy)
    (*GTK_OBJECT_CLASS (parent_class)->destroy) (object);

  gtk_psfont_unref();
}

and my X server no longer grows by a huge amount on each new canvas.

This is in gtkextra 2.1.1, I've not checked the CVS version.

John

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