Comment 2 for bug 1720509

StacktraceTop:
 sn_xcb_display_new (xconnection=0x5628cdc48e60, push_trap_func=push_trap_func@entry=0x0, pop_trap_func=pop_trap_func@entry=0x0) at sn-common.c:149
 sn_display_new (xdisplay=xdisplay@entry=0x5628cdc47c10, push_trap_func=push_trap_func@entry=0x7fe24d288de0 <sn_error_trap_push>, pop_trap_func=pop_trap_func@entry=0x7fe24d288dd0 <sn_error_trap_pop>) at sn-common.c:77
 wnck_screen_construct (number=<optimized out>, screen=0x5628ce180410, display=0x5628cdc47c10) at screen.c:541
 wnck_screen_get (index=<optimized out>) at screen.c:599
 wnck_screen_get_default () at screen.c:641