proposal to allow X-foo in OnlyShowIn and NotShowIn
https://bugs.freedesktop.org/show_bug.cgi?id=11564

patch to support X-foo in OnlyShowIn and NotShowIn
https://bugs.freedesktop.org/show_bug.cgi?id=11565

================================================================================
--- src/validate.c
+++ src/validate.c
@@ -749,6 +749,9 @@
 
     g_hash_table_insert (hashtable, show[i], show[i]);
 
+    if (!strncmp (show[i], "X-", 2))
+      continue;
+
     for (j = 0; j < G_N_ELEMENTS (show_in_registered); j++) {
       if (!strcmp (show[i], show_in_registered[j]))
         break;