(gdb) bt
#0  0x00007f51a969ba98 in raise () at /lib64/libc.so.6
#1  0x00007f51a969d72a in abort () at /lib64/libc.so.6
#2  0x00007f51ab28a2a5 in g_assertion_message (domain=domain@entry=0x7f51aedfb310 "mutter", file=file@entry=0x7f51aedfd972 "core/window.c", line=line@entry=1336, func=func@entry=0x7f51aedffa40 <__func__.80958> "meta_window_unmanage", message=message@entry=0x416b8c0 "assertion failed: (window->display->focus_window != window)") at gtestutils.c:2356
#3  0x00007f51ab28a33a in g_assertion_message_expr (domain=domain@entry=0x7f51aedfb310 "mutter", file=file@entry=0x7f51aedfd972 "core/window.c", line=line@entry=1336, func=func@entry=0x7f51aedffa40 <__func__.80958> "meta_window_unmanage", expr=expr@entry=0x7f51aedfe9f8 "window->display->focus_window != window") at gtestutils.c:2371
#4  0x00007f51aedc1afa in meta_window_unmanage (window=window@entry=0x3f60830 [MetaWindowX11], timestamp=timestamp@entry=5741881) at core/window.c:1336
#5  0x00007f51aedce866 in handle_other_xevent (display=display@entry=0x16aaef0 [MetaDisplay], event=event@entry=0x7fff968d40b0) at x11/events.c:1318
#6  0x00007f51aedcf51b in xevent_filter (event=0x7fff968d40b0, display=0x16aaef0 [MetaDisplay]) at x11/events.c:1735
#7  0x00007f51aedcf51b in xevent_filter (xevent=0x7fff968d40b0, event=<optimized out>, data=0x16aaef0) at x11/events.c:1774
#8  0x00007f51ac3ad4d1 in gdk_event_apply_filters (xevent=xevent@entry=0x7fff968d40b0, event=event@entry=0x38a3ce0, window=window@entry=0x0) at gdkeventsource.c:81
#9  0x00007f51ac3ad790 in _gdk_x11_display_queue_events (xevent=0x7fff968d40b0, event_source=0x15a47c0) at gdkeventsource.c:195
#10 0x00007f51ac3ad790 in _gdk_x11_display_queue_events (display=0x15a0000 [GdkX11Display]) at gdkeventsource.c:338
#11 0x00007f51ac3809f9 in gdk_display_get_event (display=display@entry=0x15a0000 [GdkX11Display]) at gdkdisplay.c:340
#12 0x00007f51ac3ad552 in gdk_event_source_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at gdkeventsource.c:360
#13 0x00007f51ab263a8a in g_main_context_dispatch (context=0x13a2690) at gmain.c:3122
#14 0x00007f51ab263a8a in g_main_context_dispatch (context=context@entry=0x13a2690) at gmain.c:3737
#15 0x00007f51ab263e20 in g_main_context_iterate (context=0x13a2690, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3808
#16 0x00007f51ab264142 in g_main_loop_run (loop=0x156db60) at gmain.c:4002
#17 0x00007f51aedaf596 in meta_run () at core/main.c:437
#18 0x00000000004023fd in main (argc=1, argv=0x7fff968d4448) at main.c:463

(gdb) list
1331          meta_topic (META_DEBUG_FOCUS,
1332                      "Unmanaging window %s which doesn't currently have focus\n",
1333                      window->desc);
1334        }
1335
1336      g_assert (window->display->focus_window != window);
1337
1338      if (window->struts)
1339        {
1340          meta_free_gslist_and_elements (window->struts);
(gdb) 
