In nvidia-settings overlay scrollbars are kept displayed when they shouldn't

[José Antonio]

Binary package hint: overlay-scrollbar

In the nvidia proprietary driver settings the little orange line is kept displayed when it shouldn't (changing from the pane OpenGL/GLX Information - which has a little text box with a overlay scrollbar -to another pane) as shown in the pictures bellow.
I don't really know if this same bug happens in other applications (I have only noticed it with the nvidia settings).

Normal behavior of the overlay scrollbar

jose@JARR-Laptop:~$ lsb_release -rd
Description: Ubuntu 11.04
Release: 11.04

jose@JARR-Laptop:~$ apt-cache policy overlay-scrollbar
overlay-scrollbar:
  Installed: 0.1.12-0ubuntu1
  Candidate: 0.1.12-0ubuntu1
  Version table:
 *** 0.1.12-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ natty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.1.9-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ natty/main amd64 Packages

[Andrea Cimitan (cimi)]

this is what nvidia-settings does on treeview selection change:
    /*
     * remove the existing widget from the page viewer, if anything is
     * presently there
     */

    if (ctk_window->page) {
        gtk_container_remove(GTK_CONTAINER(ctk_window->page_viewer),
                             ctk_window->page);
        ctk_window->page = NULL;
    }

and this happens afterwards:
    /* Pack the new widget */

    if (widget) {
        ctk_window->page = widget;
        gtk_box_pack_start(GTK_BOX(ctk_window->page_viewer), widget,
                           TRUE, TRUE, 2);
    }

No unmap event is received