Distribution/Version: Fedora Core 3

if a window with _NET_WM_STATE_SKIP_TASKBAR set appeares (map) the taskbar add
this window cause it does not check for this property (only if a client send
this to the root window, but this is ugly cause of a race condition between the
client and the taskbar)

so in my opinion the code below should work [and not show the window in the list.]



#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdlib.h>
#include <stdio.h>
#include <X11/Xatom.h>

//gcc -o test test.c -L/usr/X11R6/lib -lX11

int
main (int argc, char *argv[])
{

  Window window;
  Display *display;

  display = XOpenDisplay(NULL);
  
  window=XCreateSimpleWindow(display, 
    RootWindow (display, 0), 1, 1, 100, 100, 0, 0, 0);
  
  Atom net_wm_state_skip_taskbar=XInternAtom (display, 
    "_NET_WM_STATE_SKIP_TASKBAR", False);
  Atom net_wm_state = XInternAtom (display, 
    "_NET_WM_STATE", False);

   XChangeProperty (display, window, net_wm_state,
     XA_ATOM, 32, PropModeAppend,
     (unsigned char *)&net_wm_state_skip_taskbar, 1);

  XMapWindow (display, window);
  XSync(display, False);
     
  sleep (10);
  
  return 0;
  
}