Please describe the problem:
Looking at the code in both libwnck [1] and metacity [2] they both reference "_NET_WM_WINDOW_TYPE_SPLASHSCREEN" but according to the spec [3] this should be "_NET_WM_WINDOW_TYPE_SPLASH" (without SCREEN). I'm not 100% sure about this but to me it looks like a bug.

[1] window.c:975;
  case WNCK_WINDOW_SPLASHSCREEN:
    atom = _wnck_atom_get ("_NET_WM_WINDOW_TYPE_SPLASHSCREEN");
    break;
[2] metacity-window-demo.c:533
  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  set_gtk_window_type (GTK_WINDOW (window), "_NET_WM_WINDOW_TYPE_SPLASHSCREEN");
  gtk_window_set_title (GTK_WINDOW (window), "Splashscreen");
[3] http://standards.freedesktop.org/wm-spec/1.3/ar01s05.html

Steps to reproduce:


Actual results:


Expected results:


Does this happen every time?


Other information:
A quick google shows that it might be more projects affected by this.