Comment 2 for bug 938713

StacktraceTop:
 __assert_fail_base (fmt=<optimized out>, assertion=0x7fd5f0c3cad8 "!xcb_xlib_threads_sequence_lost", file=0x7fd5f0c3cd92 "../../src/xcb_io.c", line=<optimized out>, function=<optimized out>) at assert.c:94
 __GI___assert_fail (assertion=0x7fd5f0c3cad8 "!xcb_xlib_threads_sequence_lost", file=0x7fd5f0c3cd92 "../../src/xcb_io.c", line=273, function=0x7fd5f0c3ceb8 "poll_for_event") at assert.c:103
 poll_for_event (dpy=<optimized out>) at ../../src/xcb_io.c:270
 poll_for_response (dpy=0xd76d50) at ../../src/xcb_io.c:288
 _XEventsQueued (dpy=0xd76d50, mode=<optimized out>) at ../../src/xcb_io.c:362