Comment 2 for bug 93700

Debug backtrace for the crash:

#0 0x080a0b29 in meta_workspace_free (workspace=0x80ce2b8) at workspace.c:121
#1 0x08076bec in update_num_workspaces (screen=0x80fa430, timestamp=1783263526) at screen.c:1156
#2 0x0807407f in changed_idle_handler (data=0x0) at prefs.c:257
#3 0xb7a7baa1 in g_idle_dispatch (source=0x82e8488, callback=0x82f0050, user_data=0x0) at gmain.c:3926
#4 0xb7a7d802 in IA__g_main_context_dispatch (context=0x80c0300) at gmain.c:2045
#5 0xb7a807df in g_main_context_iterate (context=0x80c0300, block=1, dispatch=1, self=0x80c0110) at gmain.c:2677
#6 0xb7a80b89 in IA__g_main_loop_run (loop=0x80c03b0) at gmain.c:2881
#7 0x0806e14a in main (argc=1, argv=0xbfb5a504) at main.c:389
#8 0xb781c8cc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#9 0x08052a91 in _start ()