add the showhide test for showing a window then hiding it really fast

tests/showhide.c

@@ -0,0 +1,54 @@
+/* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
+
+   showhide.c for the Openbox window manager
+   Copyright (c) 2003-2007   Dana Jansens
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   See the COPYING file for a copy of the GNU General Public License.
+*/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+int main () {
+  Display   *display;
+  Window     win;
+  XEvent     report;
+  XEvent     msg;
+  int        x=50,y=50,h=100,w=400;
+
+  display = XOpenDisplay(NULL);
+
+  if (display == NULL) {
+    fprintf(stderr, "couldn't connect to X server :0\n");
+    return 0;
+  }
+
+  while (1) {
+      win = XCreateWindow(display, RootWindow(display, 0),
+                          x, y, w, h, 10, CopyFromParent, CopyFromParent,
+                          CopyFromParent, 0, NULL);
+      XSetWindowBackground(display,win,WhitePixel(display,0)); 
+      XMapWindow(display, win);
+      XFlush(display);
+      usleep(10000);
+      XDestroyWindow(display, win);
+      XSync(display, False);
+
+      break;
+      sleep(2);
+  }
+
+  return 1;
+}