Comment 2 for bug 1279919

StacktraceTop:
 g_assertion_message (domain=domain@entry=0x7faacf1bbd01 "mutter", file=file@entry=0x7faacf1bfca8 "core/window.c", line=line@entry=1705, func=func@entry=0x7faacf1c2b80 <__FUNCTION__.70563> "meta_window_unmanage", message=message@entry=0x5e30b60 "assertion failed: (window->display->focus_window != window)") at /build/buildd/glib2.0-2.39.4/./glib/gtestutils.c:2292
 g_assertion_message_expr (domain=domain@entry=0x7faacf1bbd01 "mutter", file=file@entry=0x7faacf1bfca8 "core/window.c", line=line@entry=1705, func=func@entry=0x7faacf1c2b80 <__FUNCTION__.70563> "meta_window_unmanage", expr=expr@entry=0x7faacf1c1138 "window->display->focus_window != window") at /build/buildd/glib2.0-2.39.4/./glib/gtestutils.c:2307
 meta_window_unmanage (window=0x58e2e60, timestamp=timestamp@entry=13213770) at core/window.c:1705
 event_callback (event=0x7fff61dbf230, data=0x2c5f720) at core/display.c:2776
 filter_func (xevent=0x7fff61dbf230, event=<optimized out>, data=<optimized out>) at ui/ui.c:253